{
  "manageEntity": {
    "action": "Save",
    "entityId": "143904",
    "entityType": "Track",
    "nonce": "0x28f7212a070f4daa08e5a5f48ea338b9531bef44fd1ae7cdbe1a05f5547624d7",
    "signature": "0x193e34c3389ac39827ea3fce6ffd9b2ae9f7fd50975b8c8bfc19490bbc28f6f23919a85232cd8a511a266f8dcdf02895747313632cbbe3dd513d5327300444b31b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}