{
  "manageEntity": {
    "action": "Save",
    "entityId": "1781944307",
    "entityType": "Track",
    "nonce": "0xa851e2271113e9c527fff479ccadb92dc35de0ab5e4c427a7073a6832069a2c9",
    "signature": "0x1b2d749f97f64d405f104707db28dbd20150c910ddc3458f8de0f1e52bc9068c38eabb8f5c25962307a4a8713cfd8ae1e736187811db830711c639a6630c4e9f1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}