{
  "manageEntity": {
    "action": "Save",
    "entityId": "1591875721",
    "entityType": "Track",
    "nonce": "0xa37192d51cf77cc6198fdd236126f9885e0b919cd6b2c2ec5cd9c1bb9dde3fe3",
    "signature": "0xaa39eb9aabc109e8950dca65c63b4c8f6303a6e0080aff5a95e9fc967498ce2a3b94635f4abcb26a95e93cd2cec1d18ce0bc7ef4b67274b5185d41eb071ac19f1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}