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 0xdf61bf6e86fff8da2a7de67b03a82e208ca1888e9992ba0efa9c8a0ae12b472d. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df3f6d97-c589-4b4b-92aa-e1bb13d99b49.json and https://artists.proofprofile.net/proofs/artist/df3f6d97-c589-4b4b-92aa-e1bb13d99b49.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 0x2787486914d0d8db45ab4d93e01e5d6c463fb1ae9db962c4b38817e9f7c61c39. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZDA42185018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a896639439af8d33d36c11399c8a1f2b242db76c619e771d74d68e9bc4591a. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZRP52402715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520587400b4589a0ab2df8a701e17b324d4e609a10e106c006c26460fcfe669a. 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/QZNWW2440591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b415d4a75ff166e930cb6087d026fa4c425ff2ef90dca584f494d830ecaae09. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QZHN62450364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bca4886d2b86e25625f1ab233c19ae619c8ffe57641b72e7974bf6d9d88155. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZK6N2314014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65baf2c09095ff1e8fd307b803f21b88be1c222e6b197f0d27f3dff6b39f62bb. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHN92369131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b40ac30e102e104e646c2ea7d87975e4702abb9c2f4715b6e43b38bb8cd435. 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/QZES82301284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699bdca333f69dc52bc8742073f249820e70a4fb968c7980678a25101bcdd3a5. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZPLR2268295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986ce7e5bc5bddc331ffaf15c7a4ab42171734fc8d33876c2c33b5a4a8dcce4c. 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/QZK6L2222871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7732828a09088ffeff5f9d5d534d6850cc1e2f3784589392329695fb18b1d48b. 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/QZDA62286549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b19f311a9aa287618b177a91e8aa0ee6494a9e6d088650a8e8aa1c6f916a97. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZES62147152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b69d2a15fe8b36f7f556883aef4a4d0eb8e763a23a93bb58a62e445090ed2ec. 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/QZNWZ2034827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9875d766bc92b16748ce4eb5617f1b56dc93e2a220868c3db7fd795d32c1f4. 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/QZMEP2001414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5bc9d6508e8da0da45aa1977ac0f8189ac581ff53f33baec2d12e77e6b7dc30. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZMEP2001415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d524b2fa24235a17de36cd14dedbc40fa100ed55e268eabb087d92709503d4. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZMEP2001416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf168c91f240fa1fd3f6ac64080b9bed794408492adacc71912c949893cc39020. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:47:09Z), 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/QZES72046570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb040345865c7fb65d3f80db1967744fc2335e65d33b9c8b88a52011f744724f. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZDA52055230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2833899709d8cb0732e5eda3964e70adb8a2a85a9dc30c6e1d1fcc63a829ed66. 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/GBMA22512587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac724956caa76c41b6a8ceb20534979250ecdef25be5670b8fd79b16c562e80a. 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/QZHN72517831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a42aa79fa197a7e18925467caf56264c25917e72c0a9795012bd77c6775b46. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZES72533722.