{
  "manageEntity": {
    "action": "Save",
    "entityId": "950899424",
    "entityType": "Track",
    "nonce": "0xa15f582adcca8ecfd0806623447f67025b25dc9b492b2b196efe43558c5d8bee",
    "signature": "0x4ec2e99b825b28673bd97a7c6658b2ff96fe4fa69bbc5a8de02e9974d33d2be70acc95a8881f3e5eeaf2a5232dda7e0a2d81b8bc02d0eac24734b45b9477aa1c1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}