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 0xc4d70e60665d7527b61bd9f6e473493fe2c504426d90d3d03e284b5d626a43a8. 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/0e1b5425-aafe-4294-8a59-1eff171c462c.json and https://artists.proofprofile.net/proofs/artist/0e1b5425-aafe-4294-8a59-1eff171c462c.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 0x7fa8237c4d6b1edfd8fcdc50900b1a1c7d7dcf783a04f8e867d6466b663ecc31. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/CA21O2109501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f77eda39b5f0ffe197fa1403fbb75242b193dd376994c8c7e52ba67882dce1f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CA21O2109502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b9ca94a39970b73ce4e294e3d02ce50f24ca6ec7d2f94d3f0dcd2e01d22dec. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CA21O2109503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9e7ed84a275dc6f614158bb158f920a4ffbe4b419863fef524761c60e2ccd8. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:30:06Z), 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/CA21O2109504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58d1259dd6978e43c7fb5d61c4c6902111a325692b4d75498d13aecc444adb3. 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/CA21O2209601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1bf745be5c5508b918cf958f1ae6aaa360e9cdf6082baab9ffc51aba99cd57. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CA21O2409613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edc8a18de1d37453b9488e33a4b53a4123d4935008876eac2e667731f218e3c. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/CA21O2409602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f228c86ce4df96b74ddc941cf5555709f83868373c11e1068fbbcd8603fe2b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/CA21O2409605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edc8a18de1d37453b9488e33a4b53a4123d4935008876eac2e667731f218e3c. 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/CA21O2409602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56c1ac5c9c699e297ddd51866663b3b2c95b300a636abf5a917a2a694ac46b0. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/CA21O2409601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e4627ef414ff3fe0cdd843c638fd75bc73aba0bfb4da7b3fe1260d4ff2f07d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CA21O2409606.