Mack Harrell
type: MusicGroup
genre: opera
description: Mack Kendree Harrell, Jr. (October 8, 1909 — January 29, 1960) was an American operatic and concert baritone vocalist who was regarded as one of the greatest American-born lieder singers of his genera
popularity: 2
followers: 25
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x38fb6df65d678c51e2b5f788281aaf2ff3cf8c2a9a8cab0de74df67334fe9c1f
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954618
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954618
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c809e922-faee-4e2e-8366-740aaae2ac1a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c809e922-faee-4e2e-8366-740aaae2ac1a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c809e922-faee-4e2e-8366-740aaae2ac1a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T23:05:13Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x38fb6df65d678c51e2b5f788281aaf2ff3cf8c2a9a8cab0de74df67334fe9c1f","name":"Mack Harrell","registered_at":"2026-06-20T21:42:27Z","symbol":"NIM1723021","token_address":"0x0e7bac9126df62f42ae3bb6e28713d025ad47cf0","type":"artist","uuid":"c809e922-faee-4e2e-8366-740aaae2ac1a"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fb6df65d678c51e2b5f788281aaf2ff3cf8c2a9a8cab0de74df67334fe9c1f. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c809e922-faee-4e2e-8366-740aaae2ac1a.json and https://artists.proofprofile.net/proofs/artist/c809e922-faee-4e2e-8366-740aaae2ac1a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T23:05:13Z
  text: {"copyright_id":"0x38fb6df65d678c51e2b5f788281aaf2ff3cf8c2a9a8cab0de74df67334fe9c1f","name":"Mack Harrell","registered_at":"2026-06-20T21:42:27Z","symbol":"NIM1723021","token_address":"0x0e7bac9126df62f42ae3bb6e28713d025ad47cf0","type":"artist","uuid":"c809e922-faee-4e2e-8366-740aaae2ac1a"}
album: Thomson: 3 Pictures for Orchestra & 5 Songs from William Blake (Remastered)
  type: MusicAlbum
  date published: 1954-09-20