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 0x466150597321a1d6f96301205c785bbfba683108099cb339ac7af7f526c91b46. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b3acb2dc-68a4-4295-b658-4aacf3e0830d.json and https://artists.proofprofile.net/proofs/artist/b3acb2dc-68a4-4295-b658-4aacf3e0830d.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 0xa25f1d0b73075854d28f6776232c504e5ebc2b5614529c1a0c38886513705279. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/USUM71111106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff265622ecce2ae3b87a686ce758cdd08ac37c66388777f2956b2797d4f80971. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USUM71111108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60bec83657f5aedc0a8eb1cb6f2c7fa14a7a169c0e683c7acf9b38f3fe2e4bb9. 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/USUM71111109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1664c467d5096ad6d9429ae15d12ffff8763c76f1209cdd0a577ea4563210ad. 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/USUM71111110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7a36d0f9b9ed1ebbe9cd856d8440030daf63efedd4d74d1b71fb3c11bc39fc. 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/USUM71111111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cfab89653320c39b0730691abfde9cd7223a6c88da5da3f4a9282fa2262b41. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USUM71111112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f4513b055e5d4fe06a21ba3e1e6061779b4b20d287be94ae8eb627e9fca2ad. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USUM71111113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b0e5b4c15dd43e7827de62df1879c6083e55c81c6c36fab48fa7bbc22dfd69. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USUM71111115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144f691d71d4dc508a3b09c5821d897a7558cf30cbd3d69dbbd2ed2dcf55976a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USUM71111116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1389fed54068a79f9e019f827cdc15bd043769f10aa5978a08b073401d4779. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USUM71207687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafd3b18c9c045f801fffa8ea044764662c6dd50242fa034a695734cc06cebcd. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USUM71207691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de5d100251da994a275ef9a7f0b46291791139000fb6f1f16c5e87a1336ddec. 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/USUM71207688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219e489127089bcd8eb4a4dc07ef6f003b2a75233e2163824f5dfcc17da06eb8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USUM71411021.