{
  "manageEntity": {
    "action": "Save",
    "entityId": "749008625",
    "entityType": "Track",
    "nonce": "0x46ad5b7a69db6f3c249fc75ecace32caa91c6b047be1e4511b96b0ed95cd0aeb",
    "signature": "0x5954b48717b1b9d0b139968f047570ed62f8f3fc7fc9ddcadfffce11c5b350f210ab05137cfa1bd82b51c3ff080392918fd25350bb05b07f66a958fa64a850c91c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}