{
  "manageEntity": {
    "action": "Save",
    "entityId": "681696",
    "entityType": "Track",
    "nonce": "0xfd4697acff9ada61d6a77130dc6643e321ab5dd4f18a4a59864a5fe23bec1972",
    "signature": "0x65150c0cb426d23fdd27f0f9a3ed2c7417bb582a676802f3404e146545d04b7502b3da2e1cc7adafe236aa4168834de58e553e22a1df8f03c80f891581c6c4611b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}