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 0xf302fb34ff48ba23d9befd1098d83a5312f42611277d6da72599506a5a1fd888. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48778b57-b163-411a-9ccd-2d13217cad7f.json and https://artists.proofprofile.net/proofs/artist/48778b57-b163-411a-9ccd-2d13217cad7f.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 0x0617fad29b81b44ce1644d0007a0b75b01dee091286a0eef325aaea371494b66. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:59:09Z), 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/QZTBB2243201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da9b67342e73b4020961ccbcaea2d1e9ae4e4935d01ad51203e2dfdb4420c4f. 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/QZTBB2243205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8320ecb32d2e81cd96c18ec2bdfb91582351a4c65b037423ca884c6010000138. 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/QZYHM2417896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24ae5a38151aad310aeae51d4a7f9af892b15e118ee1253cdf581d03e73d3d7. 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/DGA062310329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ca8d4197c8d025553cfa509851336e3b582bed18e6260fd8320f91ac7553a0. 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/DGA062344799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8605fba30b3cc1957c2ae65a24880b7cdeb035f185d7ab987f55d9dc5753edbe. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DGA092445588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9050df5950809ac33a6a198975a94997d8340f375a067372337af3b5f9ccffe. 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/DGA0Q2382417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9841bf703ba3b4c436b13c058a195fb43de166dc93a1747daada786999334259. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DGA062312529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d07254fcc7242e69d55aaf78ac1c532218495295060d2f3f76ba2712219d954. 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/FRX202238463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d56693b97cc705f8bf175228200d1f1de7403c530953d94f283d74a1fdf0d89. 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/SE6SA2073019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb65a07842f68fca036620fa4cbf72e89c121a22dbf450af9e186d471e102c9b2. 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/GBSMU8923684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5986b7d32c68ae701d8f8b841627f6cf59f59821b4e71803fa42d22975445676. 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/FRX762367367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b14c49b26142a3e38ca219b8047beb1cef5e7510a08a52a3ea2faea8c124293. 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/FRX762367368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25e74d9450010b816a0cc5eb8b80466740678e8aa5eb20b67260793a42e9a7a. 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/GBSMU8939800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1558437e29c844de0f49e93c2bbb2de0cd0028d28c735ee29b5d5e85ffffb1. 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/GBSMU8852481.