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 0x268df4e62c72f6ae258c0d4eb67441a5fa17003eb618eb8b1e81b6eabc4b37ad. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fab824a9-ee0c-4ca7-b49d-03b83aac5cfc.json and https://artists.proofprofile.net/proofs/artist/fab824a9-ee0c-4ca7-b49d-03b83aac5cfc.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 0x87c253f1f085aec9c037211e7a960d287876844e7d6ec878e4ab8644e15ada05. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRX452137172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa06a726c98317220f392f8cb7defe7604631e58c8853656106b698ac0b99b1. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/FRX452137173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6148fbf29c4aab185bcdc0c3b14353edb50bd156899854f027c9f2e6e05e3141. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FRX452137175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43a4ac68fe8ee97ceaf4f6bc1ed553f5af017c9ad0be1307f5b1814a21fdb86. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRX452137176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c6299a48a915d8f66e5fa3a8e840bdc8ef1914f3ad9fe3cba6b3f4382d4be8. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FRX452137179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe255e7d78366dd0a801b8220c7b27bf53cabb7dabac57826292d035930cc6e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRX452137180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f9a5e0abb23cc7143de8a1f401c2c052e4db65a188399ef0b98e83f5d07f66. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US3DF1970158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16aee66c8651064aea962af2918102dadeb7b50194fc5a0c1da896230ddee7d1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA0L2374928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50244898221d782a57d06b1ecabd95b43dbaafc85e597dbfc01a021134884388. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA062429200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6625f1337335d5d2441655a12469938134dc87e5b73d197063851e8a5a806d53. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DGA0P2358478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bae73944d33f603798fc3315b0e8d65304949c49dd50fc5fb18dbdbddbc13b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR59R2300351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6625f1337335d5d2441655a12469938134dc87e5b73d197063851e8a5a806d53. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DGA0P2358478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bae73944d33f603798fc3315b0e8d65304949c49dd50fc5fb18dbdbddbc13b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR59R2300351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2c939ed9af36f99bba4687d871214fbd4ed4bd160263337732dde97767ceb3. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FRX202298387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd97f818f722a1ef2e14ece21d9ad2d659e65a99a02262f9d25d88060b4b6b4a. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/FRS182080437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15aa8c142f586e1548a959d954a117506a327ec11bc9dfae419d53d61aa40e27. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR10S2076040.