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 0x643e533beed36c8d834435433b791cbcc1d9f61c2350ae309cec80af883b249c. 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/4e8f1c3a-3433-4899-a1dc-4d0154b17c6b.json and https://artists.proofprofile.net/proofs/artist/4e8f1c3a-3433-4899-a1dc-4d0154b17c6b.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 0xeeb5794ee4071ce531084e06dceeb654fab86a9627e738296b3b46a94bdcc2d1. 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/BR6FG2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25ab6ed83b2b2db433ef0d2a1c45bf31dc6a2424d18066321ebc2c9fe9f9a7f. 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/BR6FG2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9583a5c449ef54f2d6763ecc80af70b7741d189561d1edf989b08e59bac14ad0. 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/BR6FG2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2c265799ee29757aabaff770bb2e2e783cdd37f0cdc8a326cbc78c4ee4b395. 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/BR6FG2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24d33c2ebcce7b9c3802844cbe8e3afa42d3265f416e7882829ddf52951562f. 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/BR6FG2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe6928983a53497b7f6ac91965ff4d62fba8dbb53cfbfea82b5d993a44a83a6. 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/BR6FG2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b2a133f86cc57bc6ecffbd1df2b46ed5b4d35de4479733f8cce29dbe49a922. 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/BR6FG2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5539fe8dae52f24193c7c317db00e6cc6ce51beba3b6e94ade32b6527a8e7db. 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/BR6FG2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4c098b75d1383c709171368e3ce4a89d648f4645dc9f37a814c8b93ce364ff. 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/BR6FG1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b41e34aa32bcdc7aee3eef1aa9fd4fda868941d26779f3240b7d55cea124515. 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/BR6FG1700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324497f794179834d60457ab317573f99c9ecc18afe9f27de4e8f85ffd205e29. 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/BR6FG1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c2a510d44e2f226941923b22be7b8b974597f05d3f476daee4e980856c6523. 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/BR6FG1700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4940c8016c01bf23dc717e4b206dd0decb2008757b854efd73917f416ee63243. 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/BR6FG1200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae3abc10ad97171937a42351d6f418d365ac5973362c8a0b9172c61dc107e44. 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/BR53P2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78a6a0049cb002225b0a9da4c0c3dcf1cb589f27c74438bde7bb7feb97bff84. 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/BR53P2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6691f728462e5c0ac8869476aa93480ec0002610814852e4558eaba2cc54764e. 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/SEXNQ2000102.