250px|right|thumb|Sandford as Don Alhambra in The Gondoliers Kenneth Sandford (28 June 1924 – 19 September 2004) was an English singer and actor, best known for his performances in baritone roles of t
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303bea02aaf83e604c68e8d447db36cff6a519d77827d85c6153076141e42796. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da6b1a3c-7572-4048-9769-08fe456f776b.json and https://artists.proofprofile.net/proofs/artist/da6b1a3c-7572-4048-9769-08fe456f776b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Gilbert & Sullivan: The Mikado; Trial By Jury
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f060d147045f4c603bf4f9efc6c3459acb11b8b6b6eb37d04bfe122cfe732e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBF077443106.
Trial by Jury: May It Please You My Lud!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25871f3c75224e6ff5dfbad49013d8789b9eb4cdcf165c8efe1a86d058f59a83. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBF077443108.
Trial by Jury: That Seems A Reasonable Proposition
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39da118423d7f99260cefed59e71f7e83948c1db4b4623deea162cd980f05966. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBF077443111.
Gilbert & Sullivan: The Sorcerer / The Zoo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7a344eaf7fb13d0f74093b67744ade7c7368e8bd9c0105bee317e1db5b83dc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBF077743005.
20. Society has quite forsaken all (King, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c07a7727ee55592fa48ec3855f3a5a48c46661b321d28c54d067cae9fe57e2. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GBF077541821.
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
16. Altho' your royal summons to appear (Finale, A. 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639e852d888540f9d6752a69e22a6d9854eb345cf1d747155b77b7c0ed57c85f. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBF077541817.
17. A Company Promoter this, with special education
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057b3c6c59bf68a8452f9c8211ce60310a0884ef108b3e01d86b97fe05b8ee72. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBF077541818.
7. A king of autocratic power we (King, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1293b3389bd8329c8bdb746e4483f965b369a64bd5ab844c77bb525bfa1a3b. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/GBF077541808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63dea4ebb12c8e8b724ff19b01f55fb7f3b2fa2d5e244670c72d880ceb93a180. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBF077541810.
10. First you're born (King, Scaphio, Phantis)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f3323a885bdf6bfe3e4077ed3dd1927724cb79aedcc7a5df61c4bfcf687817. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBF077541811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c505be5ee16eda990914b598edbffd2e0cf42046e78a523f812056da9b876dc. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBF077443112.
25. If you think that when...(King, Scaphio, Phantis)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf485f08f8186bfc3015377ceda78e0580185b04177e9175bef1d57bf3bbbec67. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBF077541826.