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 0x4c7e10685b21b470cd4787a51b2a1ed02254570408a7cdd65ed12b8ae7638c14. 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/01899eba-a3a2-4808-9777-f05d6704337d.json and https://artists.proofprofile.net/proofs/artist/01899eba-a3a2-4808-9777-f05d6704337d.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 0xa18f69076248c969d7297bbea3b6837ad7ba79b1fe09aa8405aeb36dd71a9d22. 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/QZTB32450647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce39bd9c94c44eb16031c9c9ae4be35d514fd3a6a8755d10749d2709b54fd87b. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZNWY2485051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce39bd9c94c44eb16031c9c9ae4be35d514fd3a6a8755d10749d2709b54fd87b. 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/QZNWY2485051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3ae9b5530c0df173b4c3569bd6ff52670875e6aeb912e9f708f8d42ceaae58. 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/QZNWY2485052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985109ad1b33d8f8519e9cd17fd8f40781eba935d274ce675e910ccf08594442. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZK6M2444273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16e361b983615e35e3788522011e22dd9fe3a83b8d447b4b803e80e8bdbac24. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZES82486097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5771fadcfbc3b43e4e94d8532f151573f06696251ef8e026d9ec0ae0a5f9ac6. 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/TCAIE2499892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16e361b983615e35e3788522011e22dd9fe3a83b8d447b4b803e80e8bdbac24. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZES82486097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72eab3c70c91c0aeb4fe735277d256bb10891a58d4e8c371fad2ec39d2df7f88. 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/TCAFG2083289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af31865026fec050c0c2db61d17bb91944130717d47022b954757fa34a446c4. 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/TCAFD2049150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318e2e9ca838a2affbd7087be680912a1a23138a2caad150eea98c4bdc3e2e34. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZGWW2114787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e120ed6a6bba1d63bdb3ae2e7fa6717a9e36a3284ffc10a2f7244e8b29ba7d3. 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/USLZJ1988176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86664f4e63257583ec5fa9cbb056fd5a1a3e656ba2f688ef53ff5db97e226bb3. 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/TCAEJ1910676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7525c10b068f92adad5f70b6b75b65b19bd8c11fd1a4896ad550970e77c7db. 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/TCACF1513398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e50637353c09a6a5bc176038a4bdb7593df67273b8ba62534c9a806fc5ac52f. 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/TCACE1542745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270081402a7f1a6de4bd8e52de3c7598525d31118f837dc89a934fcf1d38b607. 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/TCABW1451860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b69bdb5a59dd9a5c6a03c34a9a2c97bc83244a5a7ec80eaecc9fbc02d04c1e. 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/TCACJ1539731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5058e2c3ba1d0b06f564852de5a9ce73e3aedd9a088b895a9fe04cb86ab21fbc. 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/TCACJ1539732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6100c4622ff1e89fffb14fe6aed6b5bbb7baa40738dacfb712ea3d7b4243dfcf. 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/USE831512757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7525c10b068f92adad5f70b6b75b65b19bd8c11fd1a4896ad550970e77c7db. 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/TCACF1513398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e50637353c09a6a5bc176038a4bdb7593df67273b8ba62534c9a806fc5ac52f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACE1542745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270081402a7f1a6de4bd8e52de3c7598525d31118f837dc89a934fcf1d38b607. 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/TCABW1451860.