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 0x6a2fbe9ab6a83add77e9d9ab3834f4243ee38147c2d107a669ff42331b0bb4d7. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a31b959-fdc7-4fe0-9c1c-1b59f03ea651.json and https://artists.proofprofile.net/proofs/artist/1a31b959-fdc7-4fe0-9c1c-1b59f03ea651.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 0x4c954126ac276ec6febd61adcd651746a3219ca0f4eb55c2b6e1dad74282520d. 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/INN241502547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e32d7dc400589e41a452a34250c24be2e877d93a5124fa556e41ad8722faa78. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/INN241502548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b4b6926392c8944090d3938c63b9c2b4c1bed4b226fa24f1609166fa30ee9b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INS671500633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5edc5257a2e5cd9aa1fc9d37889c922e49248235e0543a8929aaccf617923c. 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/INS671500634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb10efc279eb124d83c57a424e9a33f0bc9cf0bf10582968d98a4d46ae15401. 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/INS671500635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2528ec5698ecdb4a5c0123e4c11e7b7100850f0361a10b32e86de9ead98bdcb. 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/INS671500636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823f0bcbee813ff228b81854fe9bcf9982c805d8aa40e859063000bef070a0d4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/INS671500637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfa040489d97ab8fa3babbb9fed9d3a93045dc3a5b790df95994f62eee5dc90. 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/INS671500638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34baf1e58d658163ca8a879fb5e368fbba164dca6dd7ab11d4032e61b4bd5f82. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/INS671500639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f0ada8b70957cb96eaf75171d5f3c5a02bd38b7a47e7dde85b834ac36f2b18. 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/INS671500502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0a81a7e5af14f3b71cff3327ad7423505b4a6bf469f4c338b513f556eccdbe. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/INS671500503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe585d5131fd2bf9006b83a521288326570136867b0cd5224fe888e4affaebc5c. 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/INS671500504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122b866ab31c2d161b88886e69fdd0d33ab1c2c0287dca0343d59fd9d1769e9a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/INS671500505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ff1406d04b545e7241eb2dff381db846e1973b777c1df787fcde10a5c8c283. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/INS671500913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x290c8f0b964234b12ed6347fefbf6ebf2cbae9ad17a56eb934e5dba9d7927f99. 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/INS671500918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5edaacf4ba311aaf31947e7f6e537c471e7e003680b92214b4b2f3d44553652d. 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/INS671500921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05219e630688e039be0ac8b2a09726d1d8b7d2150084f7d772c4d6a9360f41da. 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/INS671500492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f22de383b3794b3eee42af71446ac3b350b1d689e44d58861d6e73ebb23deb. 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/INS671500537.