{
  "manageEntity": {
    "action": "Save",
    "entityId": "329622",
    "entityType": "Track",
    "nonce": "0x72af297fef5ab456bfcac2a570bb04612a11f72f1bdbbca2c72f9ef8cb2cff6b",
    "signature": "0xb7b1e89bda126f4c0ff7b629e339658a8e4989cb33cf8ea8c42c2d10acc8d85056dd3566559a4bd6990bdc5d408e413f0cb7fe390e20377b0e3f2c50a0f7d4971c",
    "signer": "0x7848c1438a663A70aF2A2B1e61f7A9229dcc818e",
    "userId": "490080902"
  }
}