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 0xb65c2529ae7e5f55f756e82a2d3913d4e152bc002b19b4404e589a6bd6c4f8ae. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff25d4e8-8183-44fa-8e54-5439a9ab0415.json and https://artists.proofprofile.net/proofs/artist/ff25d4e8-8183-44fa-8e54-5439a9ab0415.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 0x290ab8d87cedd715ad40dc10c48855644ed08f9608c10ac2ae39cd0e371e2cdc. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZWFK2325009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7913e2efdb99c3301da4561ab2e5f861c07984fa671d0cddf7249d5654ffa124. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMEP2345973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20340cb4a014057c85ff735106b348c44986425ee7890b8899074b3b93ca1105. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZWFH2385647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe53b4935a78d007035acb0da26c7954964a21fc1384bce532e286df4d7e890. 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/QZMEP2345978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb34f3209d7674768e6342fb311dc1fd8f30530a55850d818474bb1478371d71. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZFYX2437547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fde54dd3dfee29745d6bd09c63cd5d835844aedf03a57b44bae3ca94f080b3. 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/QZDA52433051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe492791c03ec8784fb2bab54e0b65825c088680887e413434faa6065db96ee. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZMEP2452904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4a7afd4e5fbe680ac7dd0750c44b3d0d0cc8fc6fbc18b00d19b1920b18057d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWT2407526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc1cedb9b43f14575880dd354e75c9a378e27f35f2f9199d106013797cfd8b4. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZTB62434010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81bcf6405f4277c885e0682080e03d558dfcc66e913d7ecfcb94a5fcbb8792a. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZWFR2452073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d210eeacf7274f12f3de7c46f37bdf8fdfc1f5c0748f26279445b2bce1363e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFYX2586808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fdd7f589b936c8ea95ad98f52932d3e6c99e34c29d3abb3b2124f418f696da. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/QZDA62566191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd7125b5d7fba020d9cb77d2dac540aec52b75d0c4e6d03e29a438c75beb176. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US3DF2559513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe492791c03ec8784fb2bab54e0b65825c088680887e413434faa6065db96ee. 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/QZMEP2452904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc1cedb9b43f14575880dd354e75c9a378e27f35f2f9199d106013797cfd8b4. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTB62434010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fdd7f589b936c8ea95ad98f52932d3e6c99e34c29d3abb3b2124f418f696da. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZDA62566191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fc29976bebf9b27e3f8b764c5a85c4c2bece8368d7f673a1626a8332bf9d84. 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/QZES92547364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583171930659487b1b15e77adcdade243f3d17f426e99474766ccc68d2a66bf8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHN52537287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00b57be75dc3b522e46400620d2f59e59d26178a53cb66ca6bd93bd27ffe0fb. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZMEP2345970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20340cb4a014057c85ff735106b348c44986425ee7890b8899074b3b93ca1105. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZWFH2385647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe53b4935a78d007035acb0da26c7954964a21fc1384bce532e286df4d7e890. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMEP2345978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b29ad0bb3c008447e454b3a21d5b530c6f7735a1ec7d360b48b40b4f328a86. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USANG2529184.