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 0x6df0854aad8e8fa7c020c1f0c6540c065e0ae605f8d96180a66bc892c6becbea. Chain 2 (Bitcoin): anchored in block 953783 (2026-06-15T12:24:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d52d5a1a-eda6-499c-9e54-25f69a730a84.json and https://artists.proofprofile.net/proofs/artist/d52d5a1a-eda6-499c-9e54-25f69a730a84.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 0xcf23079a0d0382668978786b3d7fde373fdb799ddd6b560075bde0d98058e4b3. 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/BK3ON2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162eb01f0391514a813d3c4caa9171eebefd5e96c56a7b766cf1d9950b4c1a85. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BK3ON2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dae55ab72b33402240e49cce3005f4a3ab49c38c78ecf3d40eec858a2108f87. 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/BK3ON2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e1cf130125f4bce6d2eec6a72571597d31b318ddb5e3c5b63a52e445f7ec30. 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/BK3ON2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda86b5edae2f44f4815e9fd0d005c82d4773196b29b9b372ef12804858c5a24. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/BK3ON2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc569058fbdec0cf2769362db86f4dc6d5a80a96256f74f684355d593626d730. 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/BK3ON2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbacd007e42a27640100ec1c4f514f8179770bbffaec1cee5aeab314c0ae4d08a. 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/BK3ON2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda86b5edae2f44f4815e9fd0d005c82d4773196b29b9b372ef12804858c5a24. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BK3ON2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3cb3203f7b5285dbf7b3a2accca2d7352eaeb99914c009cf65c8ac30604ee1. 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/QZHZ42247530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ccbd85a547fb6a868872afdb102174ef25947b3fa9fae792389de03c1c82c6. 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/QZGLS2229519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ab625015eff41fa77aa85a8f5b79e83d8a1a629f46ff0e14df56ffe90bcafc. 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/QZHZ52162264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3f766670bb74434ae54fced47960dec4d4979761afa093840c1361c9424e91. 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/QZHZ32174817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37cb294cf9e44eae21fa0e66b2b36eca96a330f0fb404474dbe5c57cc88874c. 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/QZHZ32124891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10004692b65895dc99c59f179dbe16d8614a06e47f00e062548a78437a8f152. 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/QZZ8A2585522.