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 0x30364629fb465cfd989942241fbd6506e19bcb2ae28aa1637aec58a393e9ca31. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c1d56eb-11f4-453d-83ee-50ee46b1c643.json and https://artists.proofprofile.net/proofs/artist/0c1d56eb-11f4-453d-83ee-50ee46b1c643.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 0xb1c05b0a56cc4937ade14e2b6700a3082e38f2109f4f247703bcb15145653ebd. 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/QZHNB2404055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6208b81cedf7fe837d67e2c4158dae5a60b701ab5bc21931387645bf393df5bc. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZWFR2349822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba8ddaa9ff2a636cb2326e62680615d9e8429618487ee43c8fbf0676af6162a. 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/QZHNB2404056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419798891b3bc138c49b46308410320b640bb0ce52bd8093846e1ad9438d6014. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/QZES62406543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441dd1eebe22544dcf85c0d8b86f2745f45deb2ce2ed5407537d598e927ecd10. 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/QZHNB2404057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419798891b3bc138c49b46308410320b640bb0ce52bd8093846e1ad9438d6014. 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/QZES62406543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6208b81cedf7fe837d67e2c4158dae5a60b701ab5bc21931387645bf393df5bc. 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/QZWFR2349822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db7a01674df37ab466a4cbd513699d2ebe5fae5c8ed0fba47e8c7f4d4eddcaf. 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/QZK6P2355368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c809fa2943dfed42e445dd0837a80d26e258d68c74cea4c9301ef22422a2003. 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/QZES72319280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6274591a0aa32a9be057ed00312ecd62436b49384f1e8a92b93f43d34d7473d8. 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/QZES52275947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40af7b5a5792993862470253368f81f9336df15b5eaf06b4b26064bf8c9c2866. 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/QZHN42293613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d15c46c2c8a9ef6a9ccd756c7b1171c6a79d499899b4b83c307f8ea2fcc520. 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/QZHN42293614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a14f112bd96341603e6aa8741f27f344d0ca5d68b2166ebcfbf094496d7938. 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/QZHN42293615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba4a53c165fe3b3c0ea15e4afc7eb2bb85d4ca2a4990a8b4015f26646f8e598. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZHN42293616.