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 0x77ac2091e10a5df8eb3fe6aadff1c6dd6fdb6f22f8b1b8915dc6cd85dc0610c6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4d4efeb3-917c-4e8b-a97a-c0bdeabf0400.json and https://artists.proofprofile.net/proofs/artist/4d4efeb3-917c-4e8b-a97a-c0bdeabf0400.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 0x5d221c636a42fe7aece19dde4ac2cd70fffe6062db81a22a5f6a8b06bd775794. 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/QZDA82199765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1c000a90f994f3315dd06ef709166925eed16cfd672d36da9e0281217bc79b. 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/QZHN32153271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f54add9c01277ec2424a944c3fe115a169cab96c619ef434604f659704b9d6. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZFZ42134605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8e22713a2b81409a6cf590194e2c5e1999967da2b637c3c183feec6f240a94. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZHN32153272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d221c636a42fe7aece19dde4ac2cd70fffe6062db81a22a5f6a8b06bd775794. 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/QZDA82199765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc385ca84771d821231fd00bf929527c8704d07831b22373c291fc2aa5b2e3977. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZHN32153273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaea3f43764a9b35b10857066c8f944d2610c63a85fc37ae5f2cd8402b45939d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHN32153274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87f3f7f37f46ecd70bd791fa3223ecac45fdac313abc07ba414a5ee1e684a9d. Chain 2 (Bitcoin): anchored in block 957676 (2026-07-12T08:20:25Z), 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/QZK6L2278098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ead78a7d6dbd1da3f8d8bf30aff1ec856fa7528495920593c86cdb856b2bce9. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZK6L2278100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda9cddc8d1c5820176123f1476c1ff8f0ba305bc95af4c8f4e7367cf366fb74. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZQAY2471849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7b0eef652c24efdcb4497e3feb7950c2bbecb4e68e62844270902bc31c85a6. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZSYP2465926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c18cbfe13db52739ed656886faaeeb80b54aa7f8c8e73e7f5cda89cde07350a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZSYP2422921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209f8448e463a50da5143a561b6b75ca28b6e33854ccf5d9051ad056d718344b. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZQAY2494211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48ad896320ea922a3a3b3bf531c041018afd0c76b6abaa3a0153b3f7af16b14. 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/QZQAY2472005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d974b3b2d04145fc0038bf07e5bfe8f2dee33955fc38020b1fe957c2a18470. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES92511323.