{
  "manageEntity": {
    "action": "Save",
    "entityId": "146279466",
    "entityType": "Track",
    "nonce": "0xe3180530dee8039595adf9c2adffd628b5704db94e8f3d6a4a8c6fe19d458734",
    "signature": "0xd7d8ce5e210561e735e744591971f5b1768babe5e7371a5cc7e3dbee59db69ed2acb6622f8d3203308fd5c13601b8661bd88588a91bd05231fb8c5809e843b451b",
    "signer": "0x442b56FA7fdf42Ae6c15F3A4663692903B358230",
    "userId": "142026"
  }
}