{
  "manageEntity": {
    "action": "Save",
    "entityId": "809817887",
    "entityType": "Track",
    "nonce": "0x201907d6a81c3cc81bc70aae6a03173ab830cdee7ace8f355fad5bc256ea3de9",
    "signature": "0x9ce0f3e0430d9c268ad48a74b3e684cb4d867c2342c02e2dee69e00f83a00c0a498ff5aa6d461cfc2d2462b4c2427df8c0e51c96471c5fe174f48b629fc3f6e81c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}