{
  "manageEntity": {
    "action": "Save",
    "entityId": "1978607858",
    "entityType": "Track",
    "nonce": "0x58a010307372e703c3e1d3baeb208bf95fb48d94a3b5cc0690bc6fb39359abcb",
    "signature": "0x176eef2430bcb494b39e261da434ab98c2ec4269c7580af63efd8378dcba8f835209f2d50d9a30b0498b5a11e97f359c5d859cc6370784c7fc7b0c7b230998761c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}