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 0xc55a9440b54095571b2ffac9ab18c0b115c78dfc0b58df1e59e37b1165274a1f. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/96224850-68b9-4096-969c-a9d507830526.json and https://artists.proofprofile.net/proofs/artist/96224850-68b9-4096-969c-a9d507830526.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 0x371ec18c405e7c2a11890d87268ef211963e0976ccfab45b92e8e2c5661cbb34. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZES81994289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38412a4d8d23d1149d2f4a092770c75c0c57b7695c59b404f5d81b0f79c504bf. 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/QZES81994292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e6775cfd55a22065377c072729a1ea26192695f600ea116184c7ca3ef3b0a4. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/QZES81994296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fa444c3278da8768a4ed2d48f7eaac060fe8a16fd29e82b2023f53b9eb8112. 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/PT2DY2200420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d297450cc71b0622d08a036887c7d2f71dcb7e4400f840c9aa8db97eb7bbec4. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/PT2DY2100054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122f3d5ed47ac21ab40626b3d72590fb67876406df4edeaee56a86cefc77846a. 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/QZHN51986670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc948caeef5160e99635bb569ba60c5a4626ebda36629e1dcc272da4228eb9cda. 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/QZ4JJ1822691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64dabb75c16bb691cf17b1833106eea6b3769619c14da346d7edf3dad8074129. 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/QZES51877664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5598876d4037773473a1caa131325abc7f940e5ba3bdd7461c0e7c11b8c50daf. 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/QZES62518415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7802a2e72b20c9c8e07ce08d240915ecaa7a4d3630da9fcd740f017b8755782c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GXF9Q2464540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd247659ce49a47cb9da7dee17ec20c009d8b44d2ef58e4eb6441eed08c00551. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/TCAHG2394337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebfb432b3536b7930a429a95e65735f2b93d9abef8d18c2f2535c1dfee2cd2d. 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/TCAIE2400951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3287f995300ccbcb3dd03cb53e61d02ebf929b94457685f4bf6b97f0e9a5f49. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZHNC1946083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8758c2b321ff72cc5987703eaaed865c675eb7f83ec54e7f76675284b095dda5. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/GXF9Q2598327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11ab2e0a013bfaff1aa19cc388403ed4fa78124c62186257061be7f817bd1be. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCAHR2309605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1815398a0c863a5dbdf6868efeec066942f52ef7d5a8b1b47b7174ea3dd0b80e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZHNC1946086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652e39c5e1eb7fba0280020375ff33e4299962949f3752af15a6ca0fdf942f16. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GXF9Q2598326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb625dbc638cbbcd738d1b5ec57ce74bd81c5780785a1c5bf1d1e4eb01a9840bc. 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/QZZ7R2493830.