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 0x095c814dc1d0b2e627daf3578c3f8f00c10ccd2fea43b210e5754611a8941462. 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/4ca4adff-c406-4af4-b96f-590d9816608c.json and https://artists.proofprofile.net/proofs/artist/4ca4adff-c406-4af4-b96f-590d9816608c.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 0xcc739a8a80d6c6a1259d63a8f25395505b46185edb5b06f355ed0581db4100f0. 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/QZHZ42128205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa5026ea5615f1ccd36632bf2a9c3693c92c64936c0a5d25d9399c0a541d04a. 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/QZHZ42128210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa673c1a1bb563c84b89784feced00ab22d2749b8627f90480f3b87acc3b3aa5. 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/QZHZ42128206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e28f9f8baa6e723c83d243fb276d6cdfccd8f328249989886f8f3f84a3ffd88. 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/QZHZ42128211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55338642d4c98ef11d3c50db46a9c3fd0c438281cc1b62fb9d362cc061f4970c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHZ42128207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5767d926d6d388ada3fd02fb8db3c9114c12460c77700fbfd6878727c4926c7c. 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/QZHZ42128208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c09eee7cf8059ae48c778fc7c81dc10da97633e62a0b8f6d7e6fa310124b66. 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/QZHZ42128209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b14e1459d09d2088157f014bc2137f888b7620734f16b5acd4153e8b080c51. 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/QZ5FN2368139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1d6df72db4ee71e2666b7631a4baf57a9d33bc9d18206bef953abd3cea3d4b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZTV32250262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963c0c544e73e6fca2bebb1d5bfbf940654d06d4754e7eff4b4f24f2fe231c2a. 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/GBWUL2258675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a666065a8eeed74bfb139bbb755333d64562aa3ea9739bae75b16f762718333. 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/GBRKQ2277670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9946b793daf6cb9d8c5fdef82acd7e95a651e1df44998052b1a93b46d4751af. 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/QZ5FN2261166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0428d8ac440d991ad00124446f752eb23241e956094ea7458671116120c0207. 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/QZNJX2178158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84d6ce18b5c1af20493aaee2217260177a6ec8cb977615154cb0c476ba55172. 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/QZGLM2112592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef0313d9b3c9ce2c7db3947b54269927dcc75720dc47ac5942a13f18fe3397c. 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/QZ5AB2173089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c74a10586a38d6746782462c6728785b76e20fe40669eac196c3800d8e74883. 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/QZK6H2084971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2339d2c03dc9df0770bd23a5db7e5350e262b7c5b7b7b79a53d091c91f321950. 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/QZHNA2046521.