{
  "manageEntity": {
    "action": "Save",
    "entityId": "221385",
    "entityType": "Track",
    "nonce": "0x60e3c56d649e4aa222fe427f7278fabd1770ee86f0fcf501323e09fb2b48a00a",
    "signature": "0x5b4e8c50547bbb8d046d9ea03fb9267fe7e98b7d48a7c030403c2068805e0d1862fed51d9b800034cf96df607c945ce6fcd6ef1d01d1e18b1936cfd7283c4db51b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}