{
  "manageEntity": {
    "action": "Save",
    "entityId": "1620284955",
    "entityType": "Track",
    "nonce": "0x8baf9e18c848565da109af94187d96b074906aaa011083d286bce465c5c2fa3a",
    "signature": "0xc411a71b7a10b84582a20def2bb219e5851aefcb9b470330195655bd2b51e86e7af941523fcf44c69266539a663fb8a60aeaa785d154085254b75eef397a52a31b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}