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 0xdf548876c0e154a23a13a97d1ced4d2cd4a91a826036722378c463b47819e5a5. 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/1be1ddc3-93fa-4603-bc8f-10b26e1b5af3.json and https://artists.proofprofile.net/proofs/artist/1be1ddc3-93fa-4603-bc8f-10b26e1b5af3.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 0xfaaf39fd1cd652a4d57af54d570ebe4068e719ca80f4a779c43668f5dfd392aa. 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/PLH491900120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d048537025994f0bab39a32226bc19e9e17d8cf76b6bbf4bff8e4f3f6910dd. 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/PLH491900121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123b95887312c136b60618ed71a91403bf0ed554ba467dff8ab95e8d2a3a4eeb. 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/PLH491900122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945ba2f488fb5bf840a263f92950432df2aa65448a95ddc68a5e61e936535a3b. 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/PLH491900123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x355775672003b769862cb2a78eb957ddd3d1552be8b5484a90591b44278c5333. 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/PLH491900124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39032c0ae11cc2b0cc2a2876f32fe4468dee38164aa32aab5a2cfbe4ac6bcd9e. 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/PLH491900125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a83162225a4c907a7d0b19e9af98e466ae3de0344b77b57eb511a62ee7fec83. 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/PLH491900126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105e7c71d6900e79be7a6b92cc073e324e189da365a21f29bacb6f56666a16d3. 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/PLH491900127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62fd3f078f3995341b818e01ec95444be54d65464564a42bab1dca442fe8e01. 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/PLH491900128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1dbbd1935fb901028127f600f5f123320df1e9b9679cd7548fdf036d5141783. 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/PLH491900129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b05a9ee3151d7e58c18ac992e04ad0657adcdff826c4ee62dd79dba49b7a54b. 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/PLH491900130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd711e81776d9b879d696485c711e1dbf71466857b87470ee2620990f0effe9. 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/PLH492201208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6d6a4a40fb67ac7b5a59d783f814d46497b5fb5ee4c1d21f13b25be5f8c665. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FRX762397675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cc39fe2d2906dd740752d3ae9f02af07fd28fa1d0ef459a674e15f69cff9e8. 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/FR10S2012391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17fe7f45cfd588626ac1890ca5b3944c528a80d095c3498803852243571f8fa1. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FR10S2012395.