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 0x328252eed89b706b7fd02f7d317b2c74be20c4763e44e624bffe93bb6a1f61ba. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84a2a67f-e7da-403c-902d-9a146cb44570.json and https://artists.proofprofile.net/proofs/artist/84a2a67f-e7da-403c-902d-9a146cb44570.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 0xd234a04da656c09064552d1485dd6d35099f41e151b558d14e70844d552c2584. 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/QZNWU2304115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50cd910a31689662330f0ffaa387509586032097b1483bfbbc4c3b21408490ef. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6M2499763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dfa8b2ed7c7c605498b9ebebb97254e760c63ac12d5e0a5de5f4c180a8dd81. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7N2445662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509347c3aae926603621b4e6c05dff66c476c5c5b3d3c76c6f6d08cd20b3b9a8. 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/QZZ7N2445664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7610db7305d7961cb08793d0008ffbf29697ad93bed142f36fe086336f2c9bb1. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZZ7N2445667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83931e42b345c21448322fdd1eaea71f77b3a5991c89cde76f1b509281784b66. 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/QZFZ32543860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb52575045ea74da7a7f48ac86d7273dd24078d4c269f861908462421626d76a. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZFZ32543861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e7d6750f8ebefcf752c3f97a63c938ea19280e37b1f9acc4737820d0f411ac. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QZDA72512759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa558f866da51b37ee92fa8764bfa1178c9eeb581496783b7998531060199d812. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZES92510786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5f1ce190f3800130a36fcd5952e6539ff0d1e62f0d344f4cd0f492635cf545. 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/QZHN82561982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e006139b2d81ce325d944ff1ab813c8ab2090a57a495320886fee2c8427041. 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/QZPLS2586111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af4645f68ffe1ca78e7c06471f9d8d07b41842b8153975ba6053fd682c0d54f. 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/QZPLS2586112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0bb6475e51282baca256dd6552119bb564226e2a6aaeba407c74d116cfe1224. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZPLS2586113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bf822f57acacff859636d73031bf993be3a249383f97b8fde147919890ecf5. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZPLS2586114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c370fb06dc0163a00c422b73406f6215d2a032c6ee04c105769702306fd6234. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZPLS2586115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae8cbc50ed491531ec75563e35d06c64f4a4480664dfc2e864f28282dbb9ead. 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/QZPLS2586116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07f947c1c0246a03b4fd3e9f701d8e1f67b7e892be22a61bebed062c2be4942. 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/QZPLS2586118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d965f3a49fd63d7ae52460a85cadb7d55b532057c47f6bf47b8d498adc7a267. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZPLS2586119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576bfbe0f1f8a28c75bbee0fe19e225e3f8e4faae62413b0085958d0a2cac806. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZPLS2586120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6044f08b360e32ada2880da14bd7b0d1cca477b1a99c3ecabccb4ea52cd7d7c5. 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/QZPLS2586122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd131a9bbb4497364e6411622fa08192890eca70039c9967be4b4821592bb72. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZPLS2586123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0194813b07da4a5f956b8cb147ac9dd6927b41eaa1763a89ae2eb0fa0a47995. 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/QZTB42519019.