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 0xc444ea684a778862df525ddb9d7c9f81f5c941f09548204de341bfb8e8295cdc. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b4cb841-1e09-4b23-a7ca-05b66c5fecdd.json and https://artists.proofprofile.net/proofs/artist/1b4cb841-1e09-4b23-a7ca-05b66c5fecdd.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 0x3f2c21fade910de2a357b77828fa9e79c18ae2112e4bb12a20d1fdf2ddc8c1da. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTL92182057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b5a1077a6e4f474781522ea69814b2e0ec84779563f2538bb18a082db181d9. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZNMU2239548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252017bd8fb2afa34635a47fb2b37de066451db8d63fa406af576ab3e53e00a7. 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/QZNMX2227647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b48085398e68c8c98f390e8b8cc7dc955b0a0b77ce7fd8b5c5e8ac1ed4f361. 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/QZNMY2246988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c46ed140ad444d12962896b4f5ec6cdb7903ea9a794ac8b641617359b4c002. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZL382375830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed174ea5cad8403d2f2af94ee177fd1b4cdb6e14dc1d239ceb55b8716baf6766. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZNMU2356162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a655ecd54d45b127f794ee498383c97251f2b46be518f885afeb5fb30bf7b9a. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZQAY2346689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3fa3c2fcb7d408e898a46c3754d28af8f952baab527c2c1cb398e016acfa9b. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZNMX2335897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc76f8d4e4dc2175f2c53a8d7785970e458f9680ff55eb1c05cc44ad4e8c797. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZNMZ2326768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0cfa1d862bd5154b81a9c72568659453647e4c226bd0009298518802b9e72c. 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/QZMEV2444257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f8dc8fdfde10b00767831fde97677f7c330a8805d88d5eeeb07c7279767319. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZNMU2488838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ba5dcf0409539cb653ef4d42a3554dd59ac019af1d6e9db417c91e5003b83b. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZNMX2495518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2af9a6de90c4c70e7ff1e49871c37bf4fa7423b3792dc286df5dbf099f0a145. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZJG52554255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26dd4dfd7bb14bc3a3cfb1a338d47327e126c8160d065cd3687798b2e47cc4a1. 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/QZL382508787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c30ed563fa39508a9a7c3bf5413a536cba6ec3bddbacd7893eef834e027a46e. 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/QZNB82569599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21382866e5facfd7543e9ea2d058886e08068a3bb8cc25423891b7b151996dc7. 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/QZNB82586569.