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 0x936a2141832bfe1c7049e4a2d1d22d0f8517284d33ac5121242f51a439e80fe4. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2609c100-3a75-4add-9659-0fce9f6a145c.json and https://artists.proofprofile.net/proofs/artist/2609c100-3a75-4add-9659-0fce9f6a145c.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 0x6e7135488b46075a1ae03f5479fc59f75bc354586e903d7dd9259a12064d13f7. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/US83Z2540806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0547f6888cd52e33b2edc7f735e206d62e45f7c72962b37e60e94022553582. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/US83Z2539651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776446ec7d0636d1ee21071ecb8ecd05cc65aee0fab6e7145897a8b79d050201. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USA2P1915482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8635f55b8ff3743fcc01ca8364e64c84b93084df4d26894ab59a3b7071f725. 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/USA2P2122283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5bce81663cd86442443750718410da2cb475d14568ea4e6fc0ccacf37429245. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/FRP4A2412111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2d1ac0451a6ef7c2b711904d72fbc1a24e187b85e56659990f5feeaa9b3d29. 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/USQY51603355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356ede25660f830813db93476abacd2486216536df5f4b5baa1babb05a942686. 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/AUZR10700518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9996e2d5a6867f300863ea45af9d647dbc869468f8a9ea4367df19ab48cfcb01. 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/USA2P1815634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe872dcf5c45caac5765706743de50de5ce1cdf706ce6ae85411b7dbdf4aa245. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/USA2P2136350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7795a19cc969e12fdb6e813ea3cc1ad8f7dd401e5bfaa3f08648f3fc898f6955. 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/US83Z2346180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7244518690fb555fe0fa0b61bc4eeba53c882a4f037c5c61bbdb9082c2019fb0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USA2P2333613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4232c6fd75a4d9fde259d8803ad6839552453c858d07557af0b402f3fe45bbce. 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/USA2P2457515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7255663a4fba2eae8e16397b09edc73c63d59c97dbd5aed200b236dd485279f. 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/DKZVA2400171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca17dae3943f6a7d19886903613f139c1c28c4e0e951ee799c2dace7969aae8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DKZVA2400172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161d83be833f40135e82eebe5b3614b64987a1413efd845d139b6a7cdadce2ed. 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/USA2P2039575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5207f18aea24abfafb5edf99cc316aa30f8cb3a9704d44ed815039a87551d5d. Chain 2 (Bitcoin): anchored in block 957034 (2026-07-07T11:52:37Z), 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/DKZVA2100108.