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 0x892060826fea1f29b59b11a84396a7671fc843777015ec48000fcb06a6c5796b. 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/f40965c0-51d1-41a6-bf07-3c0e23a6bf5a.json and https://artists.proofprofile.net/proofs/artist/f40965c0-51d1-41a6-bf07-3c0e23a6bf5a.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 0x4a5b53d86bcc18e8f83d096acb01b54153859ce9d29bb055817b39676231dc22. 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/AEA0D2051258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cce65ac8c66925170a3a46e97d1b5466ff22cdb817263e06bb3c7717fbd2e8. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/AEA0D2051259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a20c5b013c2a4b220c4e5fbb7b85f4751342c3da9af9ee4cf6d6dfc72de77c. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/AEA0D2051543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089553c7a3418b722b623b0dc3b35fb3259e91feff2e9134e4533b863a2b4d09. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/AEA0D2080282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9664a244f35313fe19b58c07dc8fdc551ee2eae2ffd39d77abfe8e88c63d716e. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/AEA0D2080285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabee20bb92293189ab897bebf662f8e8d48291e87905a94b792fbee165230cf8. 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/AEA0D2080287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6c2a01e9c53f6b5c1e959d12622ec4efc5686a0a3d10c86e6a1bcee9105153. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AEA0D2080288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42275fb4bef85647e085aec3fae8860078dee29625a0e0c93404b83846338000. 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/AEA0D2080290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753991df624793c7066ca28e31ff997e873443209582dd9fbba3dcbb5afde3c5. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/AEA0D2080291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5adaaf5af5353c3d66f3ec84fc60e8d557de2a01abb9088a0407a8ce1c0f456. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/RUA1H2145102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be8901b80436d54bdfde8f2041bc78f247fc0758e1cf18a9220c9f95ecf0c75. 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/AEA0Q2158126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb26f5e276413b347ffac0e48c2ac4a5aba8f45437e006aa6020fd70395fc0d7. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/AEA0Q2194750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e0c919750ed1a2ea81e63fd6f531aad0ea0c430e9a03279880bad95ce02744. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FRX452231998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2862148aa29a479f57b6eb2b00ae5ec21f04bc5046243d443035ae9f3a4e8abc. 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/DGA072275345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d6ce1a189da6a21a8741d34528c7b455785f8c28ec123b3d01a726cadb9b48. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/DGA072277366.