{
  "manageEntity": {
    "action": "Save",
    "entityId": "507766640",
    "entityType": "Track",
    "nonce": "0x1ccfdc12a3c0f0deb71ff10eab2186bce9aac2dd443fe0ac72e2202cde66243e",
    "signature": "0x29e2f475f0a4ae16be531883ba36bff6bba413e856e45233821071f567eeb5c847c6a070d6d03b93200a60ba2c8aeb20b5be513e05404113653681efdd8744191b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}