{
  "manageEntity": {
    "action": "Save",
    "entityId": "947961351",
    "entityType": "Track",
    "nonce": "0x1663aa0defac1afc5162809f0f599cbc33463dd86630e16ab50c7a9956797a44",
    "signature": "0x2fe29b810ad7b035d21747b0d1eee0f48d4e7fb4841c26e836f0ad95e78aaa744e045a00d37a46f7ef4689cd59515ff08413e25821e21dc43fb291aa67f4c70e1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}