{
  "manageEntity": {
    "action": "Save",
    "entityId": "619978042",
    "entityType": "Track",
    "nonce": "0x1405b8baa8a4a66800fca0969ab1c3a896a174d6f8351d196f6ec945e25e8e5b",
    "signature": "0x2b9243b0f6e6a83efe4e06949b0e7d417da6d69ad9ca18025c584221311876974531e8b43a24d29b186a1967e771bac316eaec7437cd96bd359c431cbbd646161b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}