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 0xfab275a152aaf549420a3d27841e27c25310f65937de8dbbf1fd2d477f75c6e3. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f4f7b59-3e00-4c8d-a719-2a13bbe31599.json and https://artists.proofprofile.net/proofs/artist/3f4f7b59-3e00-4c8d-a719-2a13bbe31599.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 0xc7479b55a1e4bc4029ab090b0b4ef1a546d0505a8273e211847953b6996c89e6. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/TWDB51800060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03b1928fc6fd813d20f3a09b1bd015cb5d0544b9f70ea7c780f1c36c252572d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TWDB51800061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf097de6db5a5d9c5a577b2dd73dc5a62639e56f1249840576ec1b931cee73210. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TWDB51800062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65aa69992bd58a147baa578973728616b4ed5f6699a3ee974f134df43d012f97. 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/TWDB51800063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7ca59a721af8218789b94445932ba0846dd67858198d29460fd6ca2c6228c2. 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/TWDB51800064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41bf5d8728bfd9ab2304849e4ff27c873b8b92851faf6cec67300d929889c89. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/TWDB51800065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2066fa7c59840bf4a1193c7115ebfc246372c3f9cd07426fa05efcb922ffd956. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/TWDB51800066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd746bc943c147185c08a13974457402302ae2cebafd7df97e0ae965f5eea33b4. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/TWDB51800067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7123a372e3d04bfbca2d1597229c485519665572d085e670a5110b8b5cf7e0f. 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/TWDB51800068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1ef4c86295127351a34d5cf37315ba7ed0753a821e624342948bf13614999d. 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/TWDB51800069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1658069cfc8f8aa79af009d7fda3bf4a2b265c3f64b668675dc1f8039f5eede6. 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/TWDB51900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff5e9a61936aefadda6bc5fa9c1322bdf9627c3a6ff120f18e67bd730375bb1. 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/TWDB51900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffcb7acbf38349671e492392848675b4a4d8597d2626c4631b1d334a0d86d8ef. 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/TWDB51900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb964da52342689ff633f6d96bff46865238a2aca882296b21ea1435e6ec580fe. 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/TWDB51900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f188784c748c56a38f40587544cbbf6fa1dd91426f0b00cd3053e11e485b9f8. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TWDB51900013.