{
  "manageEntity": {
    "action": "Save",
    "entityId": "218703397",
    "entityType": "Track",
    "nonce": "0x54405ce8edda46253c96766627826d68a40a692cb618ac0503ddd0c9989ad53d",
    "signature": "0x2d82b0f81b9f96249608b276f7222e121441f5b1029e7d8919157f60bd0a59c3648ae0e714199f1cfad3ef1181c492003ac002194de4ac83594b00dc1e1bd9271c",
    "signer": "0xc97A6025Ad8c7Ba1a35Ef7E3A3b88ABc8b2013BF",
    "userId": "666092734"
  }
}