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 0x4c530f248a9f8a30ce849b398932d1d937fe0c7da3a24338876512f9c09718ca. 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/66f1faf6-08d0-4353-8a65-e77f5d3f25ad.json and https://artists.proofprofile.net/proofs/artist/66f1faf6-08d0-4353-8a65-e77f5d3f25ad.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 0x5ba3f26705002b989209c2310f99f7662819825355f41fdce8c55a80e5e66004. 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/QZHN92270591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c10ea662b8e784897edd269e61e6eb56c97d582d3bab84b112c73ce92d94722. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6N2418681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c18a57855681b0f13cf1df9e279f444a15c6088943b5bc08c854b854924b21. 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/QZHN82579492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194b525297533e24764c3dc0c10bf231c81bae14172d637110686f120d754b1f. 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/QZK6K2272400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f74ec4d9e1c8c2bafe3002b8b4599601b96ad9d9a587408bb294fb23b71fde. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZMEM2370807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff48a679d88d8ca019b0e51fe440ffaf537ff13acb1784ae261b78a49a1ef406. 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/QZWDD2373698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2cd33832a0033d4132a12b1b8a8db8cd6868e30127318f75ae5bd6d1179f03. 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/QZMEQ2338140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d42637e33331f18666e18e08815e97249af7d776528900c6f0a1c0ff308ddde. 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/QZHNA2539609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f04ac9281391390d9e295dd5eaa31bf0c512805c1d515fdc89e936f59d79ad3. 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/QZWFM2394301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e4245269f2488f5751432a6a05b3297f9234cb66ff49b5a3beef0198946e69. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFN2300584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38880a61e1957ec577dc5011c65e829d65689cb484091bb13c85ae2cc342d563. 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/QZTBE2487039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c2b6ef0b2c3b7d0217bc99eea8195608cce011f360187e4066495107b4942a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFN2300582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efe332d2f5480b5318dad079811fcc9de1182b3852ce1bb4aaf373bbbf5bc3d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZWFL2467893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8dda975feb882acd077f658b0025149707aa00c3cc502229643d14e35745001. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN82563322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8710d258b1dcd46e9d34adcf6da1f1e8bf3bbba8ed6a0997866b9bbf36ee5a62. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZWFU2458890.