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 0x63d781ed2747bb0bc060751d969614a5bb204138818ae394f78028df1ebfe36f. 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/d1d5daf1-2571-4a75-b6b2-111488864c88.json and https://artists.proofprofile.net/proofs/artist/d1d5daf1-2571-4a75-b6b2-111488864c88.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 0x1239764831a6d43ad7b280a03307eee3b41dbf1a921c9499d5e6f56c3add0c6f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BCI932100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf193a2a1bcf25b236f7bafee1b0d46ccbe25333d7271e63e55a2ae2c433725f0. 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/BCI932200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd9bd3c4f8138372dd6d93be7bdada9d20c0806aefcb3963ab5d127a9cc9d5e. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/BCI932400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338e66d7d49441cd442b9547255199f84ee9bfd6138eaf1a0b3405491a4a3a83. 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/BCI932400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadbc64fb7fd7abd7b8bdf5da9ffacc3d7a4ef96392957fccc5e6381354b3bb9. 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/BCI932400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55fbd60c7016414b2a27907c2e5a5a0576e07f54911aa37492102366db7a934. 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/BCI932400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf1c4af0d5703f47ab414cf53ce834a884ed3f9fc9a2dfe94e286766dc477b4. 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/BCI932400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134d26c2ed6d919d6f62d08a3616b8f3d704d18a7317a95421adf4a2a352082f. 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/BCI932400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338e66d7d49441cd442b9547255199f84ee9bfd6138eaf1a0b3405491a4a3a83. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BCI932400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b27d50e64248b14dc191275fa08a4f89ecf297f7d6d0c7f922b85b73d72c568. 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/BCI932400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55fbd60c7016414b2a27907c2e5a5a0576e07f54911aa37492102366db7a934. 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/BCI932400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63b8677dc9c64e3fb48f0331c8e533c50fe640949652bd2804351df79f5b032. 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/BXIV82451339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf1c4af0d5703f47ab414cf53ce834a884ed3f9fc9a2dfe94e286766dc477b4. 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/BCI932400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371c8f5b1808c258b5dd7c30328fad192d1088cbca3cf41c30abff380f324715. 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/BCI932400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bc809c815be81e8c9fc9608d177e09d78422183e5285caf7fe51a35c52b9aa. 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/BCI932500001.