{
  "manageEntity": {
    "action": "Save",
    "entityId": "330552858",
    "entityType": "Track",
    "nonce": "0x286358f42e4b44a8091086fa90a36da3fb7a3ae5344e533c6a806791f0cbef00",
    "signature": "0xe3970043dbf78b163b0d96e68b35ad3cd4295356517b19748657060713ad583519309cbecf2b99232b69d14a2a84c48836d636d87b54dc9114cefb836b0e20e81c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}