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 0x282b68ce59e6bfb0e02fdc5403fafcfc4d4c930d23463807f7742a7056eb42a3. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d85ca71-df6f-4194-aad1-3e5ef5f1777d.json and https://artists.proofprofile.net/proofs/artist/5d85ca71-df6f-4194-aad1-3e5ef5f1777d.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 0x252d34207443cd8812d8597f06c5b39b886bba460b9091c0469e2a25f222be1b. 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/GX53U2354340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e8d9423561164d15a0ca0d645d0cf02c2f8c7272dfdc4f1fa3b31b31689aa1. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GX53U2354341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1edb4d96e8f5176aa11f3a3e7117c619a9d621569caa13419b3f09e08bd5437a. 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/GX53U2354342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dc3b2024b8b67bcc82bfdf6d5922fdaada51842d5f7d475e5451370412a456. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GX53U2354343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690d43d946fa2765688c2520dc785c6ab13a32654a71625a397d65448e53d3bc. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GX53U2354344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3454d64712e8d2b1517ca7897e27489bd9640a3f99b4627f54da1cc80076d82a. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/GX53U2354345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980827b90a3eba6cc245a888f8f4561b475883be5d5d0c613233c100a33afcae. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GX53U2354346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ccbbd1cbb3947043e12d2a04703060bb55553e24d89e2c87e9804b6bd7e5df1. 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/GX53U2354347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f39e8db79e873b386cbfd71f9795d2c5c8335b81f623be175a854c1651196a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GX53U2354348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8f42784675ff0196506f7071fe4eeeb4d9f951f2873e0bdd6d7ac07a2a73c8. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GX53U2354349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252478611443ec1a13f02067e87bd31acb3817496a734d035b71ca077017986c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/GX53U2354350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbfd389428ffd3e89f79b602f31758cd5be4a661ead96f18899b06b8b980631. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GX53U2354351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad91face2a4db0427a844b74cd381ed521d03f492662b817ff5a2cb67c3ae215. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/GX53U2354352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2ce00068215d7ca73fb40b4a98c5cded219116788b967556f302561de7ce48. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GX53U2354353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf919ae583d239b06dcc5f0c05aea5be1b7aa48286b8b187e04f04bd71188aac. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GX53U2354354.