{
  "manageEntity": {
    "action": "Save",
    "entityId": "573908821",
    "entityType": "Track",
    "nonce": "0x157fa0f17c56180aec5b0f31d65ca8ef1b6ba542e2a1c95b20a0c2f88b929130",
    "signature": "0x770b40dccc2ec27a969916f6fe684df217be75a56ea006832a805938e3aa69f360351ba7412ac50a1debc3d871fab5a35c352aae37b64abd766dac5928fbc40e1c",
    "signer": "0x26Feee0AaDc0e2d8f7aBEd5cdb0bCD7D325F618d",
    "userId": "354535"
  }
}