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 0x4d084297efad32d3211efd5f5d73d547a45e726362c924cb92798c7066161c9c. 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/40e8c93f-22a4-4c6b-abef-fce08d3b361b.json and https://artists.proofprofile.net/proofs/artist/40e8c93f-22a4-4c6b-abef-fce08d3b361b.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 0x2481f59d7ac631e76bc2e0cf96ca1eeec06f8040b2d2964709891a4378bd4790. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM24S2009751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2481f59d7ac631e76bc2e0cf96ca1eeec06f8040b2d2964709891a4378bd4790. 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/QM24S2009751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb4a7a3093352068a0e1d3339f070d5de09ee789a43a98ff70cc16658975248. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QM24S2101393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ead7821170ffed0d0e6e053cc5cd8cef8b86c3e89aa4fd32d6e1d9477d46da0. 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/QM24S2101394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e89a0bd4073e01a511a41fc9a3a65a6f56468694df366cd4b89d1be68d842fb. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QM24S2101395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ed7c915fd27436f0e06ef7d662ff58e79553c57f345c7702484c0cf9c645c9. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QM24S2101396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd250114d80ac4ce128ae3a637d0ea57256bb83e9abb2cf121020794b94f2f241. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QM24S2101400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e74ef71fe3f23712a923c4a35cce0e71ea62834266c10005bd9c2ea7e50720. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QM24S2101401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e2e317f92c61c1a7194c9b7a7500b9e378254c6d1516760cbe2af91e2b7ac5. 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/QM24S2101402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8e63b1bd3df463015fa2e5fc57b9f58b097937bd781e72f87cf15a8344a512. 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/QM24S2101404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ae113310787126d918cef2b3d90dc33f0d134e9b70ef67b387943d10d6acd6. 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/QM24S2005235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0918c03cb94704a5e12f15da1623d040f64e3a305e82266ba0f35a6fde2f8dcb. 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/QZWFN2360993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ceea111fd0d0c6ed7bde43ccc861ddc505473d895117e9b169f014dcb024d17. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZES62376261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b7baf51c953714a997face8996472482daf68710598d92ed562f221496c432. 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/QZDA72344889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9c84a78f390d1f1bae714df56f4ce1c25c4239e4004002b27b9ad461258cdd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZHN92218075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ae113310787126d918cef2b3d90dc33f0d134e9b70ef67b387943d10d6acd6. 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/QM24S2005235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe735c561beabde563c21d89d62ad4b2770d638f1da7957b3c5d8d5a8ff84007. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QM24S1925553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e90a658bca4ecbd970cf996acd3e08d0c6f0717a3857ca78787eb61fe94f63. 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/USUG11902835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cefc0af3c02eda881757f81a226e8399516579bb06d1353383b99d9b12f8d1e. 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/QM24S1910542.
Quality Control: Control The Streets Volume 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51054381b5ed664fb19def6fd5f4230285fd8173368eea529b0f76a28b0888e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USUM71713682.
Quality Control: Control The Streets Volume 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e90a658bca4ecbd970cf996acd3e08d0c6f0717a3857ca78787eb61fe94f63. 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/USUG11902835.