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 0x5d8844a9cac048c100c846a42695f5ea9ba22035eadc564063110cf2617d722a. 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/cf6b3445-5b9e-4c9c-a1f8-559c1dc30e44.json and https://artists.proofprofile.net/proofs/artist/cf6b3445-5b9e-4c9c-a1f8-559c1dc30e44.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 0x4bf0d1d346b841c40c3967b732397d4f0038b6548c6b6280588750a8b2b0e604. 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/QZPLS2333643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86be138e5c6a6d98abf8888de9a1b9706609af5da29ee70edda1239a26da52c7. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZPLS2333641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e71362ae86a51175e2bc9074ce8a840700075691559e1ec640da6d4c8f6767. 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/QZPLS2333642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf0d1d346b841c40c3967b732397d4f0038b6548c6b6280588750a8b2b0e604. 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/QZPLS2333643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0539fd5f5ffb5e93155af15166421a9fa3b4064943d9b19b26b72827541da5. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZPLS2333644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8db75794ad7cd4bd0636d02c888cbd7ffccf74a4455ac82091f4c3502f3d30. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZPLS2333646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff548e13e940b687793f5533ad63a0d2c356df02095e9bff9179e16dc0b6a89. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZPLS2333647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7749f4f773301fea69e810d37ba9180dd07ca34b8aceafddbe1828422104157. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZPLS2333648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa95719b608d353a6564a1d8d3b896523e1e121f19f138ead7f4e8d340f19428. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZRP42305137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273347fa88a51248b2b87419db6b9bf6eb71d5acad844ee520a7f2b8379b72e1. 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/QZTBE2355493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704eba47650db356f809c3c3d4b1310548b283aecda0f60a3a227ea72ddbc58a. 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/QZWFM2352402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704eba47650db356f809c3c3d4b1310548b283aecda0f60a3a227ea72ddbc58a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWFM2352402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa065658ed91c908a97fd9e1689878ce752fbcfc848535c5d53ee91e173d2a592. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZK6N2434958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12eb7ea2c6e90a16e6c890c2ebab9e4c48612ec1b374e14ac84fc77aafcad80b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZK6L2414248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12eb7ea2c6e90a16e6c890c2ebab9e4c48612ec1b374e14ac84fc77aafcad80b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6L2414248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9321aa28218f088cf688a0fd1d917c84620f59bee4cda62620e971c351d41f. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZMEM2430852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f5a6c4e2361679da33c0118074c79ab69621903663f1c1b223c6c7321349b2. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZNWR2440763.