{
  "manageEntity": {
    "action": "Save",
    "entityId": "7456149",
    "entityType": "Track",
    "nonce": "0x54d3b14fe5b20a870e63ab3bd1d273b6178813e5aa37cac4ab8221a6b3041f9c",
    "signature": "0xa6432067669d72c40f4de19f261683f2b6a29f8d9d43039ae7aae2a7f0fbe96d2b709f7c5c600e9b3e122aa5e8d09a319db68b6f1c7a7c4b21f0bf21e68f47c91b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}