{
  "manageEntity": {
    "action": "Save",
    "entityId": "2139501700",
    "entityType": "Track",
    "nonce": "0xe0941c0546e3627ab8ae91540998bb306ed35c3fc1c1d121bfd593628c8bb104",
    "signature": "0xf177b34bd9ab66fba69b52e07e5a19b5f403ab4bb374a76c873e025fce4d646a3ce2dc0e6a6d0ca6b74f1b5846bd3c522e418634582228518c6e3ef5d5d6e1f91c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}