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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa675dfe74a946fb7fde99c66bcdb52eded3b60ee5e7f09f543342e0f88a759. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c91a3d1c-177e-40ba-8f4c-2cc504108fb6.json and https://artists.proofprofile.net/proofs/artist/c91a3d1c-177e-40ba-8f4c-2cc504108fb6.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42def37f7af378d6398253b4aa7ce275e167c6f55aa9f7a59a7d986bb2d89ecd. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZFYW1950731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa25e5c0411db7e217edf1b211773eb2ae81f4120d351f5452a0d787e0f92d5e. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:59:39Z), 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/QZFYW1950732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1a2333799ccb7775d100ea6dd0aa148c79b0237de1b412330d5c48cdd2a304. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:44:47Z), 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/QZFYW1950733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d97ea3e63e53e8447b93e5026ea911f306d5b146120aba7e794cabb620a2453. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFYW1950737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46e297683811fe2d3a9a5a3d2aa30c3c063413880bc1e0fe816773804b72e61. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZFYW1950742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0618e0261e5faff53a6ab68400c7f02bf87e8bf65ff19c9039828e25408f814b. 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/JP92L2305940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab35cff71256d60649f4060ea77dcc192ae1cebf239ca6cfd155658ef0c68a4. 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/JP92L2421530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76575b3d6ca47765507bf82f196514a6f79a16538e24b456367ad5b13a043b83. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/JP92L2427520.