{
  "manageEntity": {
    "action": "Save",
    "entityId": "635227619",
    "entityType": "Track",
    "nonce": "0x0cfff2bd4b8431fe673680ed5b1a698d2531d44a9e63f943ead356b1717a1952",
    "signature": "0xa5b77b0ba347d0a93e76abb32e38dcfc2e1346b290a9b20648a66e8f5341337416052a6e2a94706031438efd60ca55fb72f017ce27ad2d2ab7f924faa04ca0041c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}