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 0x51fee717e1bc84d9969e8d7ec2a9266ae30d830e79b0fd78645a32e144d23766. 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/f2695deb-d402-470e-9ecf-43cc87ee8bca.json and https://artists.proofprofile.net/proofs/artist/f2695deb-d402-470e-9ecf-43cc87ee8bca.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 0x4d575fefd936ef2a69ad35faccb59a65b40db1c12a074b124c21dfba63d0dcae. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBWUL2431381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c79ad537bbe0d51970efa6c4d45dc91fda409f36bbead6fc4290332cf85556. 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/QZNJY2425343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91ee1c2de730ce4eb2fc7972df598dd8d35d93071664b423665442e8348aa7c. 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/GXBAV2473799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7852f8f77b33f4314b5f34225b362d4c5c28f75f378d1f076117c12cb720bc02. 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/QZZ8A2346419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7852f8f77b33f4314b5f34225b362d4c5c28f75f378d1f076117c12cb720bc02. 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/QZZ8A2346419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f0721aba3a8fcc38d30bb31d250240c564be4943e0d4dbef72d5abe9dfa812. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTRX2445867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fe077215299b507177b71ab9db9b2b02560fdd8ff4671aff7e46c4cce32494. 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/QZTV32492777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d67e717e222b65f1f522ec4154e5bbbbc148a6869599bcea5b595ea9e6a910. 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/BKHPJ2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809e74f6775e86af849ef95dc5ca31cb2a43acf07df07fb4f211ca1a2519ab03. 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/ZZA0V2401853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7e049f5706ac6efefcb46fd5029fa006b8d48b7ec15c8ab3c8f083c32fc8f3. 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/QZGLM2560403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01c958328adb8bcf5deb7e71cd03d1a4b3b70e0a307fe02e7aa46ad39e3ceea. 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/QZNJV2493041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2033a4129d65c697b99f50c2551352d72e33f2c1f9d5f4fd56df502867d96d. 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/BC6M22505875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11160cd56c1422756de0ef96348f5c165a0d850e79ed7877939e04d987c856af. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZZEB2450262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00676dd0295bf5c5b74e2fc93213f017ea584003b901c571b6c26544eebed131. 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/QZTRX2542162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1e32b35c65a4ab25d292ff3cace1611732e38634e48ebf52a13ebc18c8bf2a. 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/QZTRX2542165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413b6fd3abf0b20945c28d827c4f745d08a4fddacc0dc28ea4e2f28521f919ad. 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/SGW502233051.