{
  "manageEntity": {
    "action": "Save",
    "entityId": "178703",
    "entityType": "Track",
    "nonce": "0xdd3fb47ac8571e806c0efbea50be58b1bad05c837f5b8563b06c6a8aba610319",
    "signature": "0x42685847d452d48890bbf7332b1e1fdf7db8b6bfa8f9811172f4f19d59cc5f1f4246bab93812ad798a14f9fef7305a342f637b37bb8413c33bd1350a540580ee1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}