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 0x06bf3a30ea00feb7a2069be1d99c856b5ec68bfd8f3ffdb416c45f65c75b4f6b. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/51d0c767-fb65-4f81-bca8-60a6349b6611.json and https://artists.proofprofile.net/proofs/artist/51d0c767-fb65-4f81-bca8-60a6349b6611.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 0x1325fea03270abc1136cc3be10976d8e28bd678f47c459a720f8a1e6c29261c0. 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/HRA040857168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09659514dc47f52d04e77f9e9e002064971061076300eee85c80d03e490762d. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HRA041063155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e15d377e9e6a9c6cccb4e89ea78d9f70869b20be065677e5514a704530ab9cb. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/HRA041063160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6f0318aa6dca22cc559e264f8a7fe71441acfc6888a5bc17ef1422e6d8e588. 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/HRA041063156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104d559050e442a4c98a69db182c04ef2a5e602930a7207842cbf3efc97a7528. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HRA040641862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca43081fb09e18bfd71f626b278a4f8fddb65a48c08ab3f81b45cc31bf115bcf. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/HRA041063159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb038a9961be085813739214042bb859db7515143bf819e87af950eb726fcb63. 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/HRA040857179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb317837be83479f20e5abad22b33dc6f82b738c7e2f31f6c5ad968cf61e61b9b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HRA041063163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022d71e4bd06992eff4cb2fc8b1ce41d1016588837d2c0a1bf7d03e3e48ef7c4. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/HRA041685411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fbba0403ae836ae47912a0ba76a3f6e52aaa05a05c3bea1fc94dbdaf73e6e5. 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/HRA041477568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3435fd26fdff6930e2c0f34e4f7d1cfa741e795d632c37c3dd77f0ac46bb08. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/HRA041477574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619e60fdede97e7d41382206c64e2349e9b3dbfd4862714e8f3b24923463e602. 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/HRA041477575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43f82c6843ed6df27a605aba6c645de7052f64bb703241ce9a783eb05ebe3cd. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HRA041477579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305d045763153f2a87728745ae8257969c75701eeab885ebaa8fa0740bc892d9. 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/HRA041477570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27aea1f904782e22d980a4e9769c665e8f0aec01159e574daaeabdc19e2259d. 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/HRA041477573.