{
  "manageEntity": {
    "action": "Save",
    "entityId": "1577584434",
    "entityType": "Track",
    "nonce": "0xcb51a31741e06522d6e35c9d699e56a466836c3aaa4100db388d498008f2436f",
    "signature": "0x0bda78bb958e2a5ddd57e056a2f09e367919f728ead39547381bb3128f8ac4c508d83fe9c16892e81fb2507b00f8c69f13d52e170939112012d86181da3ae9b91c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}