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 0x08e7231fc9385491ea1b0d20a408855f4505176fbb413c91bb030b1a8eabcea3. 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/6dc252cd-ccfa-47a1-b642-6bc826be72e9.json and https://artists.proofprofile.net/proofs/artist/6dc252cd-ccfa-47a1-b642-6bc826be72e9.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 0x2a448fc54e51467e7b670d7411a30cfa9098f5022ef6b31b2976195cb0d0d3dd. 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/QZDA62160015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c88da7acb63824044713a6cd3efc13b4bac7947d1ad073d873f2a34531eda78. 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/QZHN92134976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b79151b702c8fd7e26cacdca4bcd44db1eb9d6a2fdb003b2d3e56700d440711. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZHN92134977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd703e39a99e06ee5714327f5e92c0914d6825661d3bde1054a49a39104182b. 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/QZHN92134978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522ed9db499bf69b6c7254a8f09d2579e74412a30e3218105c481fd7c363cce0. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZHN92134980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49b99120a10c2f5ace2be3734564536a980a7dba4eb8f6f273a6df625999386. 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/QZHN92134981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c972ca23b84a2e14eb6a57f316e8536344505291dbb2e0eecfad18ea4f469e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZK6K2120686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd9a9eeba4f0ba60b4ec32c8043088fb6ffafb2c646ae8e59270db27999103e. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZK6J2216121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7fd1fa14179f31a5c0ae22a28a134f07f798470217f185b549869e7643f50e. 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/QMFMG2336148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d970ac4e8f07cb3007b868166b8854678afa1708bd63f072433f19cb865a67. 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/QMFMG2336134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8514a517ded0a37ff593d7ee0ff355634bd34dfb2b96e76610913e40a7a937. 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/QMFMG2336142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dcf4e32e168d87e5ebbbef79aa33fcc9a7dfaa5ebcc65c98d4c0de30b7b9707. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QMFMG2336141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8514a517ded0a37ff593d7ee0ff355634bd34dfb2b96e76610913e40a7a937. 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/QMFMG2336142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64d5755cca19f47c4ebe0a404786da47b83a608061ba03acfcf7d44fac4266c. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QMFMG2336149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7fd1fa14179f31a5c0ae22a28a134f07f798470217f185b549869e7643f50e. 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/QMFMG2336148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d333f3895da7ae8ca7673d6882b1d047fbcf7c8e3301d21e1f9ea622c9a2a45. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QMFMG2336150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b1bfbfa4f024ada675fb8a38fd77e3711637a2ed6c4c0af92a8e60dddd7f10. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZZ7N2436240.