{
  "manageEntity": {
    "action": "Save",
    "entityId": "159640",
    "entityType": "Track",
    "nonce": "0xeae88a5138fecc0fe9488eff39f305a3d0728aca45e870d1e523a5518da7c632",
    "signature": "0xedf75ffb1213b8596d04016fef8e28d3004ccb07b6c1c84dec3f4f17beef123c76be8a7a5cd6e56c477e61ec6aaed6a28b55bb6e61ac60cec830e3d8369321a51c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}