{
  "manageEntity": {
    "action": "Save",
    "entityId": "874966841",
    "entityType": "Track",
    "nonce": "0x61e6b4fb3290e926bf0e7ed68071664a81b245fd62a38c5aa7f444e2353de5c8",
    "signature": "0x5a1ec4b7a8fe15461cf2e0dbe4ac758ecc0042f9e7b2780cc3091616f913bbe1633fd03886128a2be6f2268c3cd814464943c4100625d676fbad18352ead9a951c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}