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 0xfd020e4f8a14c30fee467af45f721310fe255d3bb9559e2a9b3223c875cee90d. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2e76cde2-fa81-42af-86c1-ad76ff62b9a7.json and https://artists.proofprofile.net/proofs/artist/2e76cde2-fa81-42af-86c1-ad76ff62b9a7.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 0xc11caf78a7a0cea8007b8a2dba0edc851bfb71b7c25609d2d95d73a5ca6cb7d0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ8B2460584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0a4519f260502f2e049fcbce37baa2a0f90918bbf437b4a4022b780c6c0e1a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ8B2460956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04b26dd5a0aee4dee2810e326564bdabfba91141e83aa9c1dcc841ed3903771. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZZ8B2457982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21e36c0a1360983188f6a35df97113370b946fd2a0650e9a74a5da1a57c14ef. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZZEC2431951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad58b05660a3506da1cea2f084237414d8087044af1881b16b8b491db6c43d1. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZZEC2431940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d17421c9177438e4fca118e2c4b619e85312b6d3ba815c61ac1f219f2b1386. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZZEC2431947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e1b39959874be9119ca81be9722ed7ae0781db569f55836b7ddb066fc9e1ba. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZZEC2431954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce4a7ecd5e2957e2de883bc612c43c6819a96b51d6cb6408120f6f9287f8ec0. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZZEC2431942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de1bd314a24a9078238cecb22432147135a65f47805be69ab2c78d958f19882. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZEC2431956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43340e27e274962ed459ab915e7d7c11e22b6c1ff30b62655d54c6f53c977789. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZZEC2431948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82025d2f21168d9270cff48741426142d15f7f7f2daa8415442174ff7aec7d1. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZZEC2431958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b97a05af9199b60dae22c40863c2e1e8d0fc2f2ab64e1d326798a8fcd1d033f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZEC2431965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb72d926ff77d7a191f9d00dcb30e04224eac04f4821bfa74983f14ab054e00e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USLZJ2508122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11247cfab60b79280b210e96fd45f84d0445e456c5218e8d5634059a882f114. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/USLZJ2508096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0a27e4c9b2677fe8ddb705068e55e4badf870deddf475a93dc7fcc08d95dba. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/USLZJ2508303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd6155535d5c4cfb541e3d7803bdc855380b81824e58b2c209beaf404ed070f. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USLZJ2508130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551519538ebaa530aacdc5f44e83aa06f07463e1d784c70018770582df827b6b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USLZJ2566176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74754376b65a0013b6fadefb01f274b1fb1bfd90645dd69e4301e07fd8dd1d45. 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/USLZJ2566184.