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 0xf44bbd3cadf73e752ce0c4d49d2e81b0fbb96e902185d30a5d4c5fa7f7f2084f. 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/75ac8bc6-ce93-41d5-a3c2-ef4074b4eeff.json and https://artists.proofprofile.net/proofs/artist/75ac8bc6-ce93-41d5-a3c2-ef4074b4eeff.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 0xedf068d4c520064f66210cd070f22aeafdfd4773f4bd6effa37723e2375fda2d. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GX7852400763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640f16dd7fdfefb3013aee57688476719929d079a4ab9e0dd34b4611583ecab9. 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/QZNWZ2307161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87aedbc46374c553cf119aa09fdb90621262fad92bc471d25c67f5b6055d0a0f. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DETO41632943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c200e08c4596242ee8374bda97b6a3e65924f2bf9eaf022e4ae68968b2ce979. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DETO41594057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e5e1b28d77fe2eebd213371ab31361dc38f0c6e4106d6be3c300fb853f43c0. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/DETO41574077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df85625a0d31e250c97a9408821ef878f0c239800947370345d7198268207c7. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/DETO41593765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a3a9f06dbc41dbaf3ef14e5fcb721aac0bb608db4ae0b12003e6106cc6dd75. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DGA082288242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2270c9f4bcbf7246418ad4cec5ab08142da79550e544f0525ad60d0372539c4b. 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/QZNFJ2307090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85f85f840a40abfc1d4c5bbda0122e9794379791ddbb1cb40adfce45f3b1ee4. 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/QZNFJ2307091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc057e0e69007d6a246333d9d235e9cfa54d95501dc2dfae9244d62d9b64ca27e. 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/QZNFJ2307092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44499bea65262d6fb5b89f2d255b05104a364294271b70b062f97900c143a412. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/NLHR52160600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b667c0d0b15eb8556f506b836cbc7212c53c6c5f7c83ec3fc3fb87b491d771a. 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/DETO41885790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b92aea3fafdc6b96dfecc26b927bc91736af603de19ab82b9e3b22b96a8fbaf. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DETO41728614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6a80394c96cc549f443984e81429a4740b7d35e9c1f1038abd5a224828bccd. 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/DETO41416383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf02a074e9ab6b927f5d06d67d52973d5f1c838e72a5fe8bcff65f85fbbc4dbc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DETO41504641.