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 0x7738f3048875ab4d240329f9c58ef6dce0d67f076392aec5da1374453b3f316b. 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/59b8ca9c-1345-4da5-a0d0-91102df4a3cf.json and https://artists.proofprofile.net/proofs/artist/59b8ca9c-1345-4da5-a0d0-91102df4a3cf.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 0x560ca94a22e072504140d499425e17a837da11b4795d2e8a844b4269943f16c0. 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/QMFC52000405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5998df77aa9581a23e72b6fcdecc3cdde7f78716bd2561fd83ee7f5f2f56983. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/QMFC52100806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c622f2dc7e000734ee6de02ef6c58cf3b52758fe414e176e6b66e34cb32209. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QMFC52100812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807360d028087c3a8962ef177b2528e9876edddaee8b1c734b4427bfcc1929db. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QMFC52100813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9eecfdd99389d31081076addb810c37c1e6e0a7b80fc4522b142bcab91dcba7. 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/QMFC52100814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c69ec9c9d02543594e930c69c94a636cc3eba8cf1f03f6a1c730cef1835585. 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/QMFC52200302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6025a33ce2f9116d406cb20aa1a57af5c7d459fe45ad3f4dc253cf303abc184. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMFC52200304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc314ebdc790bf78d01150679a2e01dd69c652a4dc98318bc1252de58b0d726. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USHM82486738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3d0dfa4451070f4a323a6da3c327e0079f11e7325fd57ca7b785fceb4d277d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USHM82486740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f226792a778158691f6a7996adfbb62fd7cfc933a2a1589a1c52fe395a827cd. 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/USHM82486744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917b124f0c2c840533b4cd3f6580c7e87ab206fa64d62e55e82280dd0288997d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USHM82486747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0db1fd857177cad0122571416cb0a1512c46a74271a44db649cd040116f4150. 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/QMAAK2459180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5558bb3921d878519eca54a8358df6b084203693c257a9d85f0be5e3475ded66. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QMAAK2459184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cb5cc1b2f86629116fd7d9ced4e61aa37f64a0014108066f4a9b6d8a4d5ed2. 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/QMAAK2459185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7b15d260f0f9c548dabdb85acc60e00f34741dd91c3bd1df78e59457822fcd. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QMAAK2459189.