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 0x1ca6007361a7ac432a28b85a0f5549f6acd413cb4b3bbc80d6d1632bb0d2021f. 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/66a50611-9a7a-46a6-b525-8774381a1e2c.json and https://artists.proofprofile.net/proofs/artist/66a50611-9a7a-46a6-b525-8774381a1e2c.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 0xa60f8ccd8d7e6d481af234142c0629c035283035c0f4a93e033ce5098b11d0b8. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZDQH2157033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e9ea8efc9d697ad7d601c6895f4ec4d1f4f1d9e6b7a43700210f62af484bf9. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZDQH2157034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b2697efb2f9bcddfae2006f9616a5b0bd30712d6af4a97042028659a4cb16a. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZDQH2157036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd908bd5253714f6c4cfa96c28646a0a19769b9ade2b5f17e4d38e6cf2ea542ee. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZDQH2157039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283e7e0c6395294229fd016ad68e451c48200fb76583341c67dc87b23163b0e3. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZDQH2157037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49138d0442624fec9681d13361f70ee49e8d2c6d1ab74fd5f8c290f42fc2c0ae. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDQH2258559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9850337e1549253ee8acfea2f81a64d193ceaa2231b45f448a1950bf58a5302c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDQH2258560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc9dfd470b6be8987763f93551beb793d08a77fe63649e1149f416251bfa852. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDQH2258563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06d80e0fc85022a0ca2cf6afecd244f3e08bdbab61e5344f4eaa47c045a56c0. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZDQH2258564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927bec1013b0d362e14ad59f77ebfb9c67641727f9f9490b94993b5d79566907. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZDQH2258567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0151036afaca6f1d3dbe82c2dc4f17b9f89697e5160512487d4eda4857f47d0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDQH2270416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf78c7b3a2d0db7013a4c9a9e124f0b797f4ec24ba48ffc9ceeeff2af8550806. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDQH2270417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb1c50e5e658670fcab78b5b63f00b52289d1053cbdf47b039624f7d25a235c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZWFJ2396818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dada02362b2e30375ec85c86c040309369041d97edf26acf803490cf8e200d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFJ2396819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ed4a9e78e9f7aa8db6cde3bfe93a39417f35aaf41fadf9c04704b700243dec. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFJ2396822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069f264378f29803c0208ea62497035556afb70d4a443209e849ad1ef3efc1fd. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZWFJ2396823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f1602726d2176f1ea04efd0fb7d8a1b86a9c7cf67c62596efec5d7c7c4d496. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZWFJ2396825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8a6ce4501a408db4280e26482bade3b4a15ef79c882bd28a74819d8606973d. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZWFJ2396827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd9ee32365963ed3f0e5db958478718f4890a82fa502e0eddbee6bdbc73407d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZWFJ2396828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171be8aa908fe150109ff99ac529f1ae1fbe09f536bc1e95475ff3c0ac626284. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZHN42432355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eaa3ad560300c1b7d48d3dbd1257e662b7288c9e091abd0e770ac576af0d82f. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USANG2419910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2e8b417c090e7ef6a8dbac218c7598948cfcc5425d55903fb689d555fd5cca. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USANG2420429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227c5e29cf57e03a508695c17044cbab7e13e565b46f85d3c8f007154eaa9fe1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USANG2420434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4e6e872b23b5c910c38d028964ae5d332db3e7cf62a41c7b158fa9286ad4f1. 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/QZDQH2427280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f214c1375bc6bd0b834abaa5eb91c9919f6bd24fdacbbeff7aee0f04d5e902. 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/QZDQH2413996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f214c1375bc6bd0b834abaa5eb91c9919f6bd24fdacbbeff7aee0f04d5e902. 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/QZDQH2413996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde0f7c1121c1ff19e104df65462ba10a21e471032e65c9a017b10349c039b40b. 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/QZHN32500684.