John Michael Burchell (8 May 1943 – 10 February 2021),"The Recording Academy paid tribute to musicians who died in the past year [...] / Artists who were honored included [...] Jon Mark". See: Darlene
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50481eca0100a97094b34abcc246a7a5c3b2db0bf5d4b1328415737930ae05d7. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12d8f718-6f27-4be8-9eec-1094b35b86ed.json and https://artists.proofprofile.net/proofs/artist/12d8f718-6f27-4be8-9eec-1094b35b86ed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d4ddae9d9ebf7b0ac6d6320ddb2a8962cd87df212c212bd1ded170f4385ed4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA748800303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9564a957ccdb2815f97a752a753c1548e4287defdd43407a68123857d7c929c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA748800304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fed216a493990fa5bda70511598057eed91dde381500a4a8edf33175a503f3. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA748800310.
Jon Mark: The Standing Stones of Callanish
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f068a3d5d1bc5f79b91fff1b7f174957e1318aa05ac540c0da32fac1b5e552. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA749020025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf616f522abc9efcabe9763435dbd14af5075bccf8e38831bb4bc1b0a5119298a. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA749200344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce3873d87f903e69f0ccfb90be5e9e836056fd28c06e5178bc9ce256b919c5f. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKC839400206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e73f5c9ea50ef7a95eb062b59a25ab3a8d4f2a523add5da6e9ca112ba53751. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKC839400209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa275c391e40ad9d610833a0f7ca7cdc32aab65b971fae94af7e1853f81ef8873. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKC839400307.
Mark, Jon / Starr, Deirdre: Quiet Land of Erin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd370f65e215230c7f3d31d62ac5da967e302a309f7734a799cb7b81144b543. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKC830003901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ee92daf66dd589daa4a538833314fcbba0932c0a40f2c866af128ec6b3e50f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKC830003902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe197791f5da28571eb6fefd5b87c834914dd5690b68453e2437ec0559528ac47. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKC830003903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c49a29fd2742e261721b6f24c7d418dff0b3e2b9d9c82483104bd8dd594fa4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKC830003909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f52272c53d954ad3bbade341f2f99011cff8e75a4b2b49ef99bc0af019532ca. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKC830000405.
Mark: New York, New York - 24 Hours In The Big Apple
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bfd5d3c3d163620092b43d9ad34e9f5b7f5a49b9bf178d7c751f3b857b0a714. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKC830706306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f068a3d5d1bc5f79b91fff1b7f174957e1318aa05ac540c0da32fac1b5e552. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA749020025.