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 0x3158904f58e810e07572697df3f863bdd5a6323d3669ba0dbab60436e08a416b. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5a0bb8c8-19c5-4f49-bef3-a0502c3d79a1.json and https://artists.proofprofile.net/proofs/artist/5a0bb8c8-19c5-4f49-bef3-a0502c3d79a1.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 0xb010d98e8971f5188437bcd2cb27f8f8e656ae96bb86a610605a715493ea487c. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/TCAIE2403149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa975eca812de04377df9a20ff2a7988aeea486f28dafb62e509b0d23e7ae2d3d. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/TCAIL2440843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309907bf823076826841a52a59b946c500d87777c3668669dfc00f0eb7690044. 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/TCAJC2435760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc925644ca9d1f0c6c5a9644fce2555f7c5d3de4da70caa9fe8bcd658a841193f. 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/TCAJG2597951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309907bf823076826841a52a59b946c500d87777c3668669dfc00f0eb7690044. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAJC2435760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a690e1657d191fe06bdb6c11078695ac4eb9c6d96132c44947e0f8c67209da. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAIU2402806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928f4cecbda6acedb241f9ab51955cf8ada3e7676ed11a772e2808f1d1721c5e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAJK2510979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd204d9d5c29a4b460898540a3b9f68537d82acf21be1321f5deb55c4d5c1215a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCAJE2500975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c61855e622ddbfbaad96a8a1f2a9b612388b927b6b652c937692d1d99af945c. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/TCAIS2425346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0a223b33a7fa0969313375989693399d0f0a9939a6d08c09ce7dd304239304. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAIM2498858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c9dedf819eafa0f8ae3831c0e87bf81816fcd27b75291568b8bbe83e9ca103. 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/TCAIJ2466837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e650746d88d57bc57546318dd4c268ff41c49f290ea0e90222bb3e339e5b248. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/TCAIH2450136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cdbb5f22898f236e0c4e449176a7a4530f6cb354b7b4b1f644d8bd53428d73. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/TCAJX2589923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928f4cecbda6acedb241f9ab51955cf8ada3e7676ed11a772e2808f1d1721c5e. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/TCAJK2510979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd204d9d5c29a4b460898540a3b9f68537d82acf21be1321f5deb55c4d5c1215a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAJE2500975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c61855e622ddbfbaad96a8a1f2a9b612388b927b6b652c937692d1d99af945c. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/TCAIS2425346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0a223b33a7fa0969313375989693399d0f0a9939a6d08c09ce7dd304239304. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/TCAIM2498858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c9dedf819eafa0f8ae3831c0e87bf81816fcd27b75291568b8bbe83e9ca103. 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/TCAIJ2466837.