{
  "manageEntity": {
    "action": "Save",
    "entityId": "666461773",
    "entityType": "Track",
    "nonce": "0xaca3fd7b8994a342700e50ff46271b0c6224b0863e3b829388d7da7484ce9195",
    "signature": "0x1f237580d3ecc24bcda5fb6caca016d0de04d8d2efbaa143b128e71f830a530e19493b507ecafe4fc51423ffc0de4170f257f7429769b2501c690bb9a2849d841b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}