{
  "manageEntity": {
    "action": "Save",
    "entityId": "829571557",
    "entityType": "Track",
    "nonce": "0xc9388d66d0fbb75e77b31f6e6ab01516148a79e33634c934e6a92aa66478f6ba",
    "signature": "0x2d37b0b65b7a0c0a28ea86576d0a85e4de06d0140eeb5f9216ea7c51d3877f8237767e1a54e6aa38f68dc6cdddfe44532008ca759db4999a1ecc631373de4c111b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}