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 0x5b27f5130489845bfcb3ac53a762ef104e6ff0dcc865695de3678b434783a4cd. 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/a2ab3282-04de-47a8-a4f3-337ef5312079.json and https://artists.proofprofile.net/proofs/artist/a2ab3282-04de-47a8-a4f3-337ef5312079.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 0x0d25f40cd9f0c8c78f76fd37ea3f281eb4ee07bbb0fea10bc6fea2d997c188e2. Chain 2 (Bitcoin): anchored in block 957556 (2026-07-11T11:14:07Z), 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/QZTBD2329166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48e79135a7f92c594dbf7e0a2c1d7eda13b7c664b89bcc02d2941947e436a0e. Chain 2 (Bitcoin): anchored in block 957957 (2026-07-14T05:10:34Z), 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/QZWFL2354304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1085ef96928406b7f3a4d34f9fe4b9448ff9867659f3efef812c6ac65083523. 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/QZK6P2427579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226f66a001fd2f60f6978f4ffef3d406912ab731dbe0723c3fa96dfd95998ca8. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZNWW2448594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4139dc90c5135bf03b87fbc1f68b26d4d7fe73482548c0a65dd41e2e64524fa. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZTBA2433520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9086849e4a261d6a10602c0e82488bd1069a9c648f4f0445a14b0efc4677f50a. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTBA2433521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867209914d3dff34fa20c033de2f1e3698d46af0211d3395be74b385462a7b4c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTBA2433522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1131fcdd4235121dd8e7552d27f4bd5050f4f77b796c6d5ec97ff4a7ab2d02. 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/QZTAT2488205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1047b5a7e65e66034893b934e43d27b6ef9fc3957701e9bb655d9d371093c36. 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/QZTBA2433525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedcc88706ace18d93b29811a35ad0eb411f570dbb196d814f60e04ba3768256. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZTBA2433528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b11c46d91e3faab18740ae700c22ec76d48cb3487c411813db60d8b9ba6e32. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZTBA2433529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb3edd83113a3ad0eae898aed578b698fdff33f9bad416487ac00f290d7024a. 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/QZTBA2433530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53fee6435be051199901b55c92e5373ed3b290bb2c41d855c707ce6429c077d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFG2402762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9699c46c59d80ee81c4236e4ee51db00273f63debd57a507615457012561bcd. Chain 2 (Bitcoin): anchored in block 957558 (2026-07-11T11:36:38Z), 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/QZZ7N2446197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1e72fb85b32b4854c61e30ff93a9d28ccce5350d5c266192939b01446690a0. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZK6J2581078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71eaaa268665a9d734c68cdcfb07b850e13f24efa1b10a9e8f3618a67eba87a5. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZTB72579014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd474d2c73a7a288e9f85d6fa2bb0d1d5dd7a9b13a14eed9661ad5f9ee5a0283f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFX2535267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994a0db5b66c7d98d86d33501454724a6c31de9c7a8352d6d6926822f5a4ca3c. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3EY2548912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c49b58490acc4ece5bedd5583eec9893ab1a080ff89fee79995b229856071ab. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT3EY2548920.