{
  "manageEntity": {
    "action": "Save",
    "entityId": "1894255961",
    "entityType": "Track",
    "nonce": "0x90c21be37eda329f4bf05488b04d82451ac1f1600bf5661ec5a923925b6e24f2",
    "signature": "0x6491f6a01fd41787e5764998f1d3c7c0dd56174b3d12684c0afd5cc41c02703c66bcddfdfd38cea435780d30862a6d9002c2946008027bcea782364b0a76b39a1c",
    "signer": "0xfa1f98f0530E55C2BEFA45f0F1B3A699b4559136",
    "userId": "149566028"
  }
}