{
  "manageEntity": {
    "action": "Save",
    "entityId": "357645333",
    "entityType": "Track",
    "nonce": "0x8de4b319aec594501fc92dd8994b9f28d4b5c414fad528db34d8c39a74bda6f9",
    "signature": "0xb81157645d76b75753486389465cf9e3db94da0c774c96484477aeee66e219a602155be49447129bd35e079a45eece51be1f0879595e479758e98792cb7ec9531b",
    "signer": "0x690b8E3ECc02141CC0d8Cc1f257ee760EF482d86",
    "userId": "267813348"
  }
}