Anthony David Bernard Sylvester (21 September 1924 – 19 June 2001) was a British art critic and curator. Although he received no formal education in the arts, during his long career he was influentia
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 0x8e6ebee8b3eedb62a0dfefa29802345577e4f9567cf936349cd59cb37f58d057. 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/f5b4cfef-086a-4a6e-b97c-1dc383f66e07.json and https://artists.proofprofile.net/proofs/artist/f5b4cfef-086a-4a6e-b97c-1dc383f66e07.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 0xab625a17af76d49bbf84a75217c361dc225c0523bf118b7eadf37c3a2dbe3e4f. Chain 2 (Bitcoin): anchored in block 957535 (2026-07-11T07:11:01Z), 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/TCAIE2434780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed84d6a0336d1ba0ec3293a489f3567859aca0bb5f91fb98496b99e27534864. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAIF2434795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4966e9d6cf9eddac23b80d10c47b1cc90a06dab55394d1af48a1b7c8a6aca21. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAIE2434798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cc5e32385ac9be84dd9e1e1d507ed877e3a8cbef1231bc42799c632d7086ee. Chain 2 (Bitcoin): anchored in block 957531 (2026-07-11T06:55:18Z), 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/TCAIE2434803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e463b5f3fb3a148daaab67ee6d1092d09a10c16d031efb5ff05508b88484fd. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAIE2434836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf97cf41ff061420807affcd5b0882cb62092b595936a5e84671b711d82346bd. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAIS2445481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3b29c9424356ca66bf37079912fae327077cecc8a6de4e975585a808eac04a6. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCAIS2476030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f68ca2bf72d8c7f385965f6977ad6544401de32f09fa37471a780c2fe6a5f10. 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/TCAIS2433793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b452af934b32d9bc6d4a12de9aef638e0898a22032e3b907ea796672a977f89. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/TCAIO2463667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32238480bba5da458edca08a4204e80ee3b139a03581d29df0fd1227f99ab71f. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/TCAIO2496375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc461e384f4d4b15df349fcb9fed8964d89168178f1aeb4ed7a6dd38f10aebc. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAIP2479349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2fd3aa8505016ddefa735dd5a94ea09772222007d7bffa587177b4e22401e1. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/TCAJD2585806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9801cbd991d4f97beb6b0e87ce601a9e355d6c6e3cda09c81b89f7eb8b698ce2. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCAJD2591796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b22576cf61ae525e79efd65c49cfd6db9db20cdc03721cf95a2c2a73461820. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCAJE2542392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54db7c55e8ea859a7f6d6eaafdc92f0e2eb21875a63d7f2e4cbf7502cfec21c. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/TCAJR2509119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6cf50af5cf65f7a57b9659e8b350f13ba918668d44c6dd39a4956dc5dc1def. 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/TCAJS2509130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c79df7e559e02abd8851e4df86c308e78188e7d6e72a4d786721a406bac7da. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QT65Z2564236.