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 0x6f0582aec39120be93cdeecc73f2c7327cd61a2cda5e900d63d61b912cfa7053. 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/a4b1a9af-c502-454b-927c-7b96c175092b.json and https://artists.proofprofile.net/proofs/artist/a4b1a9af-c502-454b-927c-7b96c175092b.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 0x818870970a0c850f92b1ecd9a8f78f968847954f3bbaa5df4da48b74657d7420. 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/FR59R2116260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11947d1c99e891994d675b53931e4e5e277b2e79055f60e58214294b0724d97c. 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/SE5752229872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32e6348b149e77e00257956bf34abfaa6b9cbd068fb9b2b472d96047dd026d4. 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/SE6XX2153612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1db455e1717e8aa4d4c26287f79161d7a8311260741d0bb5a6961a3f0696c9. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/SE5752229874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015a24ae380caadd4b1a02a1df6b2d2411687d104be9b62893604051b5fb27cf. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/SE5752229876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0aa5814eadc6f9d4a36087d65bad23e1ccaf49ef029eecc5eee80349706cd8e. 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/CHF032400704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6be43b733d72ca88415626fb3dd60637bc49bd7bd87de702464a6aa60731b4. 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/CHF032418373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4523ec1bd59f5eeb0e1f3c25c2c8d4a07735b17c951732c24cbafe9ea49b7d99. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/CHF032506145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9019848d538afa80d5771056937c1426a141a338366276e4b6ff5bf31e1b1e. 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/CHF032408102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5cdab44472022c41945cf79647a6125a3d7d04a1db501cdb2d0f6a650bb935. 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/QZTB92216789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770ebc290fc472f66a04e2dcb56d77cac78ed5fed02db3523941a953d3953eb1. 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/CHF032406695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a6cd4501ed6bd2660be242c6f8df94d9f78637a5d2000815080661452cede8. 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/CHF032414900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb08a4b09e436609d85d7b35c4a872b7de8d908fbd26bc7f59aee311092f83c1. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/CHF032407666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0268aa14f956c1a08a4ac5409112d9aa3c81f7f03148b6418afe34686997cf1b. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/CHF032407667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e3a2870ed49426938bea170bf6bebffc483dfdc243c9a65f108253ea846b09. 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/CHF032407021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fcbf8b16d7aa251af9659e58b0a7e6d042b65dce69d46e58ae4711f9f23a570. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CHF032201007.