{
  "manageEntity": {
    "action": "Save",
    "entityId": "320063920",
    "entityType": "Track",
    "nonce": "0xf6b29b2588feaa143187a316aa4752b57182453666bf500bc4b758481a914cfc",
    "signature": "0x42bb314e1631906ca883147b1da230da6ffdf499473e29e86193ebef196989dd55fcf9ae63c9a5e435077c09349cbdcbe8e609bd5ef3facbc1c515f37d455fd71c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}