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 0xdc6c6bd0d682b8b7fdf9dd856653fe7e136a846246a72be5d857a328ec03f498. 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/c3b173b0-9e4b-46dc-acb8-611540d06fc5.json and https://artists.proofprofile.net/proofs/artist/c3b173b0-9e4b-46dc-acb8-611540d06fc5.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 0xbab201c2f56f592081dd12bac8a5f2cacd0ce540c09a736117ec2d0052598840. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/BED762210001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933e6385c3b707b0eeeb6c9ff8bde8d3b55c48d335fdb82a28d224bdfa7942be. 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/BED762210002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f48d4e3a24c1b74eda41f5277a8575d76fce5f90a7089b2ca434199fb2da33. 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/BED762210003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4940e9bcab1fceb9e9796f1c03762121862190aa79aabacca3f689a6980315d. 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/BED762210004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e56339768596e52576ea8ab381a8a12786ac4a60f1d35a5d1ad83e31046ead9. 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/BED762210005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07681090f7713572cc0a8dde97895c6f7cbd68c0845f7e5fe3983425c2e315a6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BED762210006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549a33bea2a7d5b644cbcafc77df1fa2313b34d2a35ce7d26e81927b95561b52. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BED762210007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2acac742eca14df880dfcf4ee67befae7c5b6a7fafa91386aab37226925cf6. 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/BED762210008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e0cef9db219946ca3b1e55790378e6468a819e58940ee1195ca9e910ec7075. 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/BED762210009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616a15867adcb40cdc77596ff4bdcf0abb381ddc80ddc370f918e3b2c41784de. 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/BED762210010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16768ab411a8817dc8da9022cfe8ab9a52eb9f1d95496449252d699c43734da2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYY1943729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e56339768596e52576ea8ab381a8a12786ac4a60f1d35a5d1ad83e31046ead9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BED762210005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933e6385c3b707b0eeeb6c9ff8bde8d3b55c48d335fdb82a28d224bdfa7942be. 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/BED762210002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98800f207c3f2ba4dffcc56aae1abfdd742df7786a208fb3795aa2822b942ed1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BED762201001.