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 0x62458c57074dacb2912b9aa8e2bcb131b1e81489624256a36d16dd35992941cf. Chain 2 (Bitcoin): anchored in block 953670 (2026-06-14T18:07:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5906105d-c985-4be0-be2d-7f04bdee384a.json and https://artists.proofprofile.net/proofs/artist/5906105d-c985-4be0-be2d-7f04bdee384a.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 0x07ce8cbc8f4c90e95ee898a743d42a5f0035bd07d88a1ec478405c69182b1874. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZNWR2200909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1cf61054a70ba2987ea3275d729c3f442ba4be7d8c14c7aa3f6270ccf137e4. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZTB62237611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655b22ac7c136ca7f1c687e8e3b6cf0b1b9fe36ecef095f82528181229817df4. 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/QZK6J2482014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3e99d73d4383ed0c6ff7226289f509a73f4d8c60f2f19abe0bfdec688d09c7. 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/QZK6J2482015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebcd3ef504d7ce72e5688f7ffcd776343cc61ea2aaa3550832ef4c56955ee0f. 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/QZWFN2478131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c56e103c3f36a3f3198eab0e582ebd6bc89135ce4ad10942392a67a3341797. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ22581876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1cdd6a45b695589cb25cd4e85505988cfe187597589a5d44910281b24827d7. 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/QZES72587666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd40763bcab134e0df4bda15da8ed34e2a57b6432a8d9205ccd3f6f66c32c3aa. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T22:26:03Z), 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/QZNWW2561827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543a72e8dbb42e877dc9e086570dbc70d237abed5ea90550b470930f19081e30. 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/QZNWW2561828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bc3a93bbcfe776125c8b6a29f9d4f83be85df8855a30ae65ac4eba050779f5. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZWFJ2517705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0013c6064bf571b1934c0c289bd36c7a37404c6c2183dcba47cc65a1be7899e. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T15:15:26Z), 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/QZWFX2583686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04edb6401105825b4e40bdd0893ed82ab2a28b25142f9d18a15b91894d2773fa. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:37:21Z), 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/QZZ7K2551430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8361a52ff19f339a336d368941ac82ca38cfc9f4bc14a94ddc78c9a9b138bf. 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/QMFME2576451.