{
  "manageEntity": {
    "action": "Save",
    "entityId": "816945732",
    "entityType": "Track",
    "nonce": "0x6e2a2091b34a589598b102bf3f218dd02272b3a49f5ddddf835d11021240ccd3",
    "signature": "0x8f7d686a74c7d2c6eb396850cf9357b019921d18a16eeeff1fe84bee510b197e1752d88cd78764980601f7fb3e341751f848f051c6527b251f698694062678c51b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}