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 0x1da881ac1ec52b133ccfbf5c1879ec368bbce0a30008fed4aec2ca49603857db. 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/d11c7ac2-0f67-449b-b523-1eaeb6357b26.json and https://artists.proofprofile.net/proofs/artist/d11c7ac2-0f67-449b-b523-1eaeb6357b26.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 0x84d95d3ddab3df893d983b74b375fa7c8ebdc6fcc10167933580adfee99910fc. 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/FRYFD0000222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62baad912c633d04a6a82e81047d2326e945d52dcdd45ee830f271e9b1d757dd. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBGYQ0200228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85bba0a536e457a6ea4684d9e4df190dd61f216727b20b663ba0e942218d9876. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/FR6V81247074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5779c5d1c70a4964accf3b9101713f8285b470d73c424e31b876331f46a2c783. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/FR59R1477439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ee3a3fac3dccaf4e43612e4809fa568c3c34f3e4029a5a21174102acf78e39. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/FR59R1477441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d1afadcfb569424a4cfaa63e1ccf3270a2e311a07c039355cba7560c9edcc3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FRYAS0543230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b03d946ca9b766d0e4d372e3bcc3c8afced11f09ddeea8c924aef0f7aa6fee. 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/FRYFD0700240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f369488a3851d4b2097f867f54dd65fb236d32a03bd0f0ecb66be08d5cb180. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/FRYFD0700241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43497146318c5c0da722c262556cf737c7e664bd5d93acb993eae707871b186. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/FRYFD0800244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7984a40dcebf42550bca12545ae0e5d9a441cc18c70c7e7f5543864c1a79ee. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/FR72X0801007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718f16c687ae8841fc0839df38d1c2a08f74ee6f2e5726c905d679d346130821. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/FRYAS1004757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff24893bf75b744804e9851b28f4b7a6e736719018ba7e03ebd96ee1f04b6b8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FRYFD1300251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44dff0219adb51ef9eb2d966a3af8e818118b8fbbc8705cad1745815e387c79. 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/CAA0Q1622327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d78bc622371ee671814b28db27f664345dcfa20be70e5c9a33cb937cfeb75b5. 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/FR6V80217205.