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 0x75c9d17e111c6da9c301004269417ae3792e15f0ae4fec0d860e2916d2e01f06. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b987d0c2-4a0b-45e0-89f9-b2ca0ed61e5b.json and https://artists.proofprofile.net/proofs/artist/b987d0c2-4a0b-45e0-89f9-b2ca0ed61e5b.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 0xae2660bc2bf0cc5f74950c241b1f14ccc2f2c91e449e74a0994a7b8d08c76117. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZHN62134492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b387a346bea3f155bbe49687074c0dc47d3d94f85f771e452410c927ada872f. 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/QZHN62134493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66941b15b062d2c521f4daa12952810238e14d16ade07f74df6968f5404252b6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN62134494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c6a61bae08984aee558350d5e073566c721060fca6ea31456418ba5d44e381. 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/QZHN62134495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a1a6c6f4c63f8676195d491870bec9591ac9fbf49904765b1588ddb20a2b82. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZHN62134496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41defa18c9824fc111eeabd88a5980580c579c6827f7b600597faeb474932dc6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN62134497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898313e8d52ef7a6d339db000fe3042acd715feb04696a822596e612d60dec34. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZHN62134498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e4708d51d56630782e25247290ecdbf8f6bf0b02ce1092181b89066a5c671d. 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/QZTAW2361190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b4dd5a5578bd1ca2e0d9bfa07ced7a2afc7897b1c157aac5f096cf8d9e89a0. 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/QZTAW2361191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b387a346bea3f155bbe49687074c0dc47d3d94f85f771e452410c927ada872f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN62134493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7390fbfd42757221b1b3dee32c2dbc4915160a27c11c4f0bdc8208befe8f6c53. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/QZHN72031997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6e2344a041c0e702852ff2018aae0e30897dc19a49ba747632201cc749ca54. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ4JJ1943535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059b6622bffc997f9934dff10087d9b88d01f78dfa52c70c42b236f3a04cf560. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ4JJ1943536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe2297ed767febab09b238a00e282ea9a38af17eaf33cdbeb6b6c9bbfb4da57. 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/QZ4JJ1943537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744cd8026cdd71bac749a6e82fdfee197028f1864dbfa178f577e3889db689b7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ4JJ1943538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41680b58b82fe233df890ec4bbea9d1c992ecfed17ad1d32f3ea97f51f6d8607. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ4JJ1943539.