{
  "manageEntity": {
    "action": "Save",
    "entityId": "542654",
    "entityType": "Track",
    "nonce": "0x30ccf664c12f9e80623da717333e1a699a7674610ce291abec7843a97baa9989",
    "signature": "0x4a2e2957c93bc61b86e0c4f76672aaf57074fc8c1b3d200759f339cac82eb6e12eb510365763d4cf51d8c85fae1234d1e80f7230532f006629157eb31d35d7631c",
    "signer": "0x5501467AFaA7897fBBD65dE583c7E74577B92f74",
    "userId": "608591950"
  }
}