{
  "manageEntity": {
    "action": "Save",
    "entityId": "775092558",
    "entityType": "Track",
    "nonce": "0x5f5bfadb049fd02dc1cc3dc0124095e976327bb894ba741463c5513eafba66cc",
    "signature": "0x8c1ff7820abb3334c843186b011fd5f6602e7773ed7493ce3a1a71ee47312d6107fc80a356bcfcfd773c977aadb9004d0d46d968c11c29e3a88af0bbef9520f31c",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}