{
  "manageEntity": {
    "action": "Save",
    "entityId": "308678979",
    "entityType": "Track",
    "nonce": "0x3874cd670531f1238139630050057fc43bbd6421f686d166456ac031dd72e6b2",
    "signature": "0x2b5e69b754721bf66b6f8143c26796f31dceeb1ce85e77b6964b693a2d06202c4a30ec59678a0319b72333f6864b6d0c8e2f1f2df9108783a3f09ea9251ff6e01c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}