{
  "manageEntity": {
    "action": "Save",
    "entityId": "1445121012",
    "entityType": "Track",
    "nonce": "0xee52c8bc057b7e746f4aee60716e6b2bee6e954c189cdc639c1105c8e9b24971",
    "signature": "0x0ef64ad3c495102bb37305bf7a12b31032d1ac49329adf7e4404c2f0d1a1bb42150997eedadfaab5289d1a4261e2484e4ab895bc360c3d6f482b5ea87690c8c31b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}