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 0xacc4e2f9f3822e2772e553c6db11f63bfaf370e50fdbf8e9c049560844156512. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b608225d-3cfc-45a3-9629-e1ba51e89316.json and https://artists.proofprofile.net/proofs/artist/b608225d-3cfc-45a3-9629-e1ba51e89316.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 0x3c336b423bc1406900c731e8098a5f6d289ad99f77ae0b4fdccbaa499ba575bc. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZTB22596161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fccfb7fa76428c7aae244832074466567191db2feeb175b81320ba0f9e0521. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZTB32584870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28265d371651747836479fd0f2fabd459c3459b5d3ab1a0a9eda0de9121aa678. 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/QZTB32584871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda8229a9ed0d0b6b90ed5fe8c11ffdf127699cede054ef0b81406856a263025. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTB32584872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80490e6da23f5dbf3e4e53ee845251846befc0c1f664add976cfc74b4ec6cf1. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZTB32584873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfb8f0f64d6ee98b15f507be0c094eee4b57dc968401754fd2cd073eac4b9a2. 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/QZTB32584874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8763c3482a0e2680adee2c20cfbb0895c8428d3728bd8f704f25ac21647d6a68. 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/QZTB32584875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e38d38391da47848b30bf3d30092f155cd4a23d727f85da98e15bc4499031f8. 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/QZTB32584876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6852066c786df5fe3784fe797bb3f6d47491b1f01070d67c1bc68f36e618fc5d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTB32584877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8316028209fbe946cc2cdf122b72a89e5aa7adf69c2d1f0b58d09a7996f7f2. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZTB32584878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b31c1f4061189fb490435708f4e3c1915f7c62c2aacb8106e1f21c39320a91c. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZWFT2587222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e427ebcfdb5e4e1e39df7178838a11ab5f32f69ef6699b147bd3d82b431bcff. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZWFT2587223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e51988d4a2784f39d6d0a776c11ce4c9aaed7279bf265e19769c701e9cbfa8. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZWFT2587224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1fa5df7dfe4b927b3cb44319bab3e9c718235f8b137d19e019a277bb6df6e6. 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/QZWFT2587225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1104d520ffdd7990e121c97e6c2e8dad36cd6a14f38a600849c58a1338e834f4. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZWFT2587226.