{
  "manageEntity": {
    "action": "Save",
    "entityId": "1881561878",
    "entityType": "Track",
    "nonce": "0x1d5e46769d4515b1cfaa6a0a9cf7bfc6b21cbacd89af39a2e1c0bdd6d01989e2",
    "signature": "0x71022c13c376502218416ca6f448fb703b53451ad0f70e2b89323de70f47cc0d4499c695cdf6153f42877cde210a2e76acf0b66c387997b4ab9d5649459b58381b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}