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 0x87ca65653bc7922e8d5b6ba283f8d10fbf692d426d49ca9e677463d3aaee8853. 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/99bf6585-0909-4d20-adfb-9509867f0550.json and https://artists.proofprofile.net/proofs/artist/99bf6585-0909-4d20-adfb-9509867f0550.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 0xe3379c7530255294f6d235f91859853f7b133adb78b11415440a0c3097013333. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DKBV70603902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece2bb6c21d1d9a7c913664cf5bd0517be026fbfb878f0dfa42a08de556fcda4. 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/DKBV70603901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02acfd63ac1123e1605c140ad0ce484bacd6b737342ed8edb7bf395d5a7188ee. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/DKBV70603903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7cd942bd27451e797b056b2d3f846192349e0036a0c7a728b41c415cb87d22. 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/DKBV70603904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2050be7fa8bddb750daa72a18b6732ab9a6f8afc4c1124088366b93a4727955. 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/DKBV70603905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021aca042f83e7c9aa1126cd2d7f7212844850ac01ca2edb6b09b5dd7ed95bc3. 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/DKBV70603906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3bccad38f9085e30cd86d83fc947aba0e34b71956373e6da8c8486f07a10f7. 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/DKBV70603907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5bc027b5cb38e35cd434b10a0b1cd4befa357d59025f11f8c49063138ef0024. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DKBV70603908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804dc19acd8236743cd28de36d6eed3913bfcc1a30934532d680cb6ed652b322. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DKBV70603909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005317270d92d3bf470af93e712058d81968efe31ae527700a2024867ea0cd7b. 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/DKCC50400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac751e956b1fbe2a99e884c206b74d0736be6855380ed6f0c49d46286d859a1. 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/DKCC50400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad89896c0dd62c25e47c73ecb5b01c85040a01ffa264ec16ca454fc34c5bdef. 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/DKCC50400104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399f424f7b2f01ccc13103fa47889ae0d25c330c77624e014b5f2ce84839ea9b. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DKBJA0201401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7eeb1d54d42cf48c56987374ce81008fba8e5235bbdd7490dbb4a0c6f20d9b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DKBJA0201402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5fb6a8fe61a4d783d3438c6d88de39b0aed456ebafeb85836e1e2d39773fc2. 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/DKBJA0201403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabed464dde21c890900a67d1efe4095c89b15a1d0bac5080bcfb81b4355e9450. 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/DKBJA0201404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986f8aa63451f7a04274f645a5f4058bd6fe7aaa50eec7b71488dfcc8da84d8d. 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/DKBJA0201406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90bedaf8aee4bdf6c6d60f4cdb8f6ac7645083cf1220d3b57fcf6688a1f6743. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DKBJA0201407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52db6465e1ec8a570841c4da4ae1cb29d8022e1b70acb3d64dcaf5341543652. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/DKBJA0201408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95e32fbaedee11505939c523c4dc4c510cf8e476542f905f40a0de006c44de5. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DKBJA0200601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa53768cdff652eecfdbe577d27327633e7c8552e45247bda17e25c50f004fa7. 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/DKBJA0201411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44dba25a3938ac1e69f649c2965aafcb312d1085577d8857a02973843a75600. 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/DKWF92300101.