{
  "manageEntity": {
    "action": "Save",
    "entityId": "251786682",
    "entityType": "Track",
    "nonce": "0xaec77aa0b09612788445647efabefd10cb62000f3bedf2c9793fffa3d72e26c4",
    "signature": "0x389b53700cc0dd28871272915f57997d70ac9263214d00a784b5b5fff5c955e51e1ce4a79b8a533b6670addad37a9a0eea5cc60c71a49ccdf3bc7c43c5c2f3ef1c",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}