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 0x29f8ce1bc406d8ec09f7bbb5f5d2959f0abdfb66fcca528f9bf03175358c5fc8. 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/a46a7f14-13dc-452e-b1d2-6484a2ea009d.json and https://artists.proofprofile.net/proofs/artist/a46a7f14-13dc-452e-b1d2-6484a2ea009d.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 0xbfb2d48ac2b5ced17b2e401ee1aab96f484cbdcc319a8cb983b45393030c05af. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/USUYG1347112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b30bae470487a6795af04fb3a074ca283dc035e8e9a1072736d62511a255bf. 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/USUYG1349229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc851e773a4fb2dc2517f3ec5bcf65938ecc3850ab294425b9a28f5a4a37c93. 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/USUYG1389394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954d41c3a257c4355376b81cffbfaf007e39637c267525c0e9fa50b0530e88e1. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/USUYG1396537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7854bf6203c482e56a4bdbbf63e2fcce2501c8ebecdcd2fa72a27788defa9fc. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USUYG1396540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48c536318db8ea16b3ab0b0c11b9782c5bc3efd18d60f25ffecd4fb9442c349. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/USUYG1396542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0424bea619b07ca792e58e762d37b1da75a59d004c20fb079792869c810466a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USUYG1396544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a986955ee253d846bd4b8981edff486cd95dbd0b52584250e36608e6e7e800. 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/USUYG1396545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7494ae41e81b407364010d43b7d0d29f8a443668a42908ab3d2e28c77242c440. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/USUYG1396549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa224083ddce57a7c5ab32b4ea48995713cb131ef69e75a3cebbadd6d143c2d3e. 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/USUYG1451873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107c90016d2bdf87cb0774aea157954c18e7ec6e04900d60e9ccd28c75e65842. 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/USUYG1538006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e381fb18c8e11a9505dcc9de3361c275588337e8a9a0f9dd16fe55670c01f7d. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZWV32445903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1870bed4a24b9479017ebac6d37bae30d1c25aed3a92f030f24b6f0004e13118. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USUYG1575852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506faf2682173084da071f3536958a7c838b9552d4e7e354fde65b4a0fa895fa. 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/USUYG1702707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e6ff38fdbe2961257a0280b76da7d150491e057aa3e1ee38a3facf76607e1e. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZDQH2445428.