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 0xd18b7d7a00ecc85c96e880c6d2b28c9619b30a2eb700cb810bd3e6bcd6b41ac1. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd8d33b7-bbea-4f08-8bd6-f9d57e5da7eb.json and https://artists.proofprofile.net/proofs/artist/bd8d33b7-bbea-4f08-8bd6-f9d57e5da7eb.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 0x802fdeae84cd23f68fe4c2bb50fc0adbc4c31ea59b9ae08dcf03eb14501a87c9. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTB52498992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa959867a8d54424fc214f9db333109d9c9b495a797616812e8d1458ad7b6a58. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZTB52498993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e80072de36bed4523b977858803943d0227d9d89976ae2fdb0c5b30dbc7409. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB52498994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a88d966750bd28fa8c556fe0de333b29aa349d2a9172306b75a40f3e79b336. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB52498995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3477a60696120c051614811af0b6ca406a783cce112bd103a09f91d499e404f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB52498996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eeb0df219eac94bb776d7fd608f608b2988a6632066c10dd8e1255457eced4b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB52498997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7945234697d3bd775ce8d598cf5ae47b79cfcbe7091188aa49a5896e64180b41. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB52498998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c3cc02b9cf2a42f896f26c381eb96a45ae1fe8f81b0589641920b99cbcda74. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZTB52498999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09227c829e3c35056ceb3820c13c97d683d31d4f47a82d22146ebc9bbb522528. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTB52499026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2db8cf2e7c53a9bfb8efab08ec36986da6672c5d878d29692a73e95005d31b. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZTB52499027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032f02d430d18e1dd5d00173bd81feb0e9d45598de8041275ad6ad9caaf00bfc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB52499028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9579175de8227ebba1c66080e0bcbba3fedf2f92fb0ed77bec18e1505c22d0c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB52499029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25f5393a32ba3d341f2968dd0a55c752fbc51f4538176853fbc902d049eca09. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZTB52499030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169806e55c28eaefff96ed174ef5ceb94a19a319372bd44e3616bf0b77fd6ee0. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZTB52499031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa2e5d8c62c11584bf8a36cc424c4882e8771db010a1677814d5bbad5812649. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZTB52499032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3565ff71651c390e3bdcd7eea898054cd4cd3636c606ba2477e8b3dcea63f3fe. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZTB52499033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa945a108b4e008ebea72311cd222421d06e6dff8281a5c6da79bc388ffe0eed4. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZTB52499034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e98a4041b4afecc529c6271cea547b7e8ab6b90cc47cbc7c4b859d4b0f858a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZTB52499036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf277375d142042a5ae8bbf4f386371bcccec587ea6c88bce3fae0614ec68c4d0. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZTB52499037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e12713f1ff5db1097abb66a109431261fd96fe153296f4373fba88f4fe7a970. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZTB52499038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb950f94dd834e39ecb54a1a643311c8ee0bfd5cbe1fa1aca795f600bcc386e9d. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZTB52498980.