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 0xdb84290d7fb911879daed523ae79159edbc5f9de816deb93c1c5ffc233375354. 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/550f314b-8c09-4a42-aa52-7462e6d7a1fe.json and https://artists.proofprofile.net/proofs/artist/550f314b-8c09-4a42-aa52-7462e6d7a1fe.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 0x3a6070bb60f4f88ddfeb9d4c230d0106787fc1fe5f263924dcdbbe3091712ec6. 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/PT7ED1700824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05b613ea5cfe5b30cf20d8ae622a734a07ec889a6f4ea3afb328b7d9ccc135f. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/PT4IA1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf953a1fb8e5b0378bf748f8b610b2334864a4fe677f838ae484cfde9d70812f6. 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/PT4IA2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bc468f55de6f674c3e08bd1f5ecaef778c72e14af35f8c86205c5d3080da54. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/PT4IA2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf953a1fb8e5b0378bf748f8b610b2334864a4fe677f838ae484cfde9d70812f6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PT4IA2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d77efa5edb664a88638400c20bfbd4a5510f6c26e998bdef25a852fcfc2f80. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/PT4IA2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b043fac66216dd4fb46c6cb783030212182d897bf4b75f488279f9e72ebc3b4. 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/PT4IA2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69155b5d08b7ca1fefb93616ccbc3adbcaac8c22452534489d0019bec96cb71d. 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/PT4IA2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616ecbef8e52b835664d64aabbe7e669ffd647f4cbd2bd4d3c84c581eb57e355. 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/PT4IA2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e10d40ab679a873f5afb6203c9cfd7f00579dac9bbb6284b9448d2fb071a519. 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/PT4IA2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f109aad1c2d2fa919c215766ef928c301a9bb45080b26bbc1ed581b6541972. 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/PT4IA2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b363339c6f1e902140be3d1d3feb29c4a189589daee25efb35fc705f6e9329. 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/PT4IA2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a87f8e0f8fd991dbe1c1f7035cf5cc1b2d6e84a7d3197c020ebc9ea78b14b4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/PT4IA2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcea4f1fe631a56ef7b06f2f379379d06dd854ecd063f65e3e29aa11abf30833. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/PT4IA2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b81daffcdb10355d5f3e84efa69aa0a48db40ff1d873eaff9f008e660339ce. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PT4IA2300008.