{
  "manageEntity": {
    "action": "Save",
    "entityId": "251658675",
    "entityType": "Track",
    "nonce": "0xf554a6610bade3f022dc2e09518a9b3b4ac11c298e813321e451988c16b031b2",
    "signature": "0xfc3f732ff45e0e04f725fe098cb0a918de5c1167b69af15e2d867aea805b29914da8a0a48d24e70ee9cfd49a54e12fdf5ce3952954544ef91125bede6f2576981c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}