{
  "manageEntity": {
    "action": "Save",
    "entityId": "1219298819",
    "entityType": "Track",
    "nonce": "0x71ee3e3c7fd716c1ef648b0a2ddeca5b2fd6f047bb1f50cf89c0be3ea9ed4b48",
    "signature": "0x621031575afacb8c35a75a03ef49aca4603f3264039862533853242258c135213beefb4ed1e51ad3fd1f1bcf97f6acb1356aecb9161530fb77d6afeb5b48610c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}