{
  "manageEntity": {
    "action": "Save",
    "entityId": "543473",
    "entityType": "Track",
    "nonce": "0x929a6daa802f304fe5529f94536b33097958c6da0d9e0270e71c9bd47eb7848e",
    "signature": "0x3c3ed4be8e7debc799de6645c3289d13e7b2b19e6b0672250eb997eb7963347e207d44a547abde3f51fee10ba87b0e10fe08a500bd5d2155645ffa15e014ceb51b",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}