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 0x843dd1d6ebbd5018e175355988523f3736190f5a5db627fab165d7026b747fcb. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e2feb73d-de92-4778-8c4a-294bdc96c08d.json and https://artists.proofprofile.net/proofs/artist/e2feb73d-de92-4778-8c4a-294bdc96c08d.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 0x3b840b4d15d12582113718cb940c602a7b247f185445574b9befb1cbb00ab3c7. 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/FIHVV2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe3a891d25c3555b5c15f7b41cc4745224038353dce88d026878f8426febeb1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FIHVV2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d7dda65bc3b20a4136b42e15d1b222150b68606c536ccff27433545cd1dde7. 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/FIHVV2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d7dda65bc3b20a4136b42e15d1b222150b68606c536ccff27433545cd1dde7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FIHVV2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa796563c87ac72a091d2298c9d7bd95977b0bc2667ba5a0866fa1c4f4ecba333. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FIHVV2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89676dcb34cecb9bb251bc11e005cca03916ad16ec21c1894d4be690678c47c. 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/FIHVV1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08eea35d9ef5812765a5afaeaac51c93f7ce7c77101af695d4539490af428201. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FIHVV1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21697db83ddb697228dd490c456f15e474dc0eb70e81acb566f44eddad25ac20. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FIHVV1800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e1918e253b8a59585aeb038885cac2c41fd0eaf6a10c68d37b87568d3c8b2a. 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/FIHVV1800017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2014460916cfbb63977c4e1a9d8dabfa9b285eb0addb1048353ee776ff1f67. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/FIHVV1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2a2005ebdf9b7fe44aa2f3b8b5f05f5b344711f19eac55eac7a9cbb02e8b10. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/FIHVV1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a4a311ce01a4f5f17f6ce60254b9081ffc70c14712652b4f977b8bc3932eb8. 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/FIHVV1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e7be8c1e2f14aa90785c2b7867fda45fffe1893690143ac0e8461190b96983. 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/FI5CK1604426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c388416142649bad47f5d31b5d53688d1aa2d787ac02021771b680afcb64e39. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FI5CK1601859.