{
  "manageEntity": {
    "action": "Save",
    "entityId": "1305724269",
    "entityType": "Track",
    "nonce": "0x29cc3e3e1292ca3182cc8e08975f2ea2097eee87b1db228c6e9434259be97a91",
    "signature": "0x5ceb19840a6e3c14a3ac78131fbc8d3f7a6d4425b858140b9121580e844f4ff84fc478ad4287620879330bb1a531cb4cde4a1a3960f5666ebe0c7a59d56bcd081c",
    "signer": "0x4dafC3e774A1033C5604372f17ccBDcE545f478D",
    "userId": "889450527"
  }
}