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 0xcffefbc40041094edb60d8cd5d654217edd320c471a972537593f240a02cc34a. 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/8dcdf1c3-d6c7-47dd-aae1-05a4e64957e0.json and https://artists.proofprofile.net/proofs/artist/8dcdf1c3-d6c7-47dd-aae1-05a4e64957e0.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 0xaa2f9cad606587aa926a2d7d127239763e9fb3050881118f780d18ceeb8579a6. 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/GBWUL2466096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9f68ea0af88d661d87c367856e011d2fd1a4eb18639480cc83fc86a18515c3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLZJ2257453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04e46b4c8fca8c4e544a453dcbea67463247be2c8c798fd47779dd01621a881. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USA2P2139351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680942a0c092e5c5d1b15d54fbfd123defbdb01b9eb5a05ae347c66eef7d8346. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWW2019175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279c204272b942c633efae02de9d62580ed8cb1f9e6c6c464e2aaedfbecbe4bd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTBC2452878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f307c40b6110c33a5c1d3fa4f33d3c7f50459d963e4b2d4f15dbaceeb2cf054. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4Q2474744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bee23bf7cab4374343d6b68302bdb9822f32fea6bed328e3d00a0afcc09a2bd. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZTAZ2430807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbe30d217674a696ca159709ffaf6da3e816c2450d7b35b1ae98a4064348807. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEQ2435620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1891c9d045549edaec0ddde49d91eb739607f94c92a2b67a2cb70bf0befdafca. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZFZ22494270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a280d27356c6778dc7204c9f05a005c95f32210c654519352d9c712d946c6e8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USHM91978788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5175b8e99bd62e6fc121e5de077be8732c706b87cec34c2641ddf89d3c1fa33e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/AUGBT2362915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d82063d07a2a239e693d1834b0f549514e3d8178f6e764856896844cd841e6c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/AUMEV2338608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276ee33d0cb2a1ad0dc2f25040cc654ad87a56de36d7650296569cd1949b9978. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/AUGBT2327566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d91218b801aa38cde7777016fdacdd22723cd7ffcb21b58a3fb42e359ca9fca. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/AUGBT2362929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0580fa353ea73067ec0da93a3eeb0000c76db33ea810369dfa0fee7c3021fc81. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/AUGBT2327572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b9bb5ed761224f9d31df3c5a9aef208c875c2e7d14820c67e7692c370aa2e7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/AUGBT2327574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb07ac013dcdfb3ff3177c334f567814acc141d98d9f1bcf4e6044cb1ccd240. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/AUMEV2307029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f760d3f57b363aff8a94fb38d93f3715d389ec205ee74869a1eba727282b8e3. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZK6N2507192.