{
  "manageEntity": {
    "action": "Save",
    "entityId": "538618269",
    "entityType": "Track",
    "nonce": "0xe406353640d3a00677caab864eacc6297b2dd823e38684fca48822164b82424c",
    "signature": "0xb6b6d86879e404c1f173c0324be7d02fda5a5547d1a8a81c60adf4db1cdd7fc2220edb2908e08fa4b926b07cbdbd9efdffe898a39968cda8f4e2a1a1f1ffd1fc1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}