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 0xb7e2deba77f916567c476fc1fc45e20fba1e346b3086e26444cb379535004126. 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/929e5e5c-fdff-40d7-8e33-bbff168e9df6.json and https://artists.proofprofile.net/proofs/artist/929e5e5c-fdff-40d7-8e33-bbff168e9df6.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 0x47d61fd923f14a9ae3502af869ede61a5de036c776e5398d738973328fd41275. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/SE4P51400301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14626d3fc437f380e7e1832396bd73dcb08f32fa3d71c3fcb4261cfc6f79be8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/SE4P51400302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5544a8a505f0908b2b8705f1a9833c1c66fe5714e520239275954d6ab5e4cd8. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/SE4P51400305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2bdb4201c31208314e9af291e591edbfb3f18496cd4689ad8042cec1ab0933. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/SE4P51400306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d23ac47ace80b8ab4d5b7fd6ff9bb8e416603bed6050b8c9f2870b823028cc. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/SE4P51400309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceff5ed2fbe91fde9cce25c3557b0cba459b4e6126d6049a87e393e92cbc0827. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/SE4P51400311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2d17a748c8c020d6344c5c638fd604ff89f2a11c6b660d6f17309ab20dd273. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/SE4P51400313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1bdeb4230411bb45e029b9b372ca67e4d5ed728826b334e89668f9ac871c802. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/SE4P51400315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f8b487a235f8b80ba9cee3438f72b3f31cd71e500d4eea05fe63d26b0e8a07. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/SE4P51400705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644a47caec1e63ae9e53d1e8cd7737a02a2ab669f12fa7b0aab81253047b6bc9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SE4P51400706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88854e2ff1a5d5ef438b7ac7889e18186775e7ab1e561efc3bd5029d18810cfe. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SE4P51400708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcd5b8982a86da92c7711f5f84e5a0f4efa9ee8b4720d5354b3a5394d90b07a. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/SEYOK1628268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0ca2b33ba67e71c33e09d0c2dd8ac90efab6fc95a28a0518e4958455ae4ae1. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/SEYOK1628271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641c3504c4b8c109a78d86a49518165877261836d87d7227d992788049f13152. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/SEYOK1628272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147f5938db42cd294aa509b12a6e6f660bce77b5f9c1897b052659ee277b6f44. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/SEYOK1628273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6499e21d0f272142e5b509fd8be1ca57c4a48da3ba2e7d9c538ea8773adce1. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/SEYOK1628274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f5da9f0210bd528ca72b4e4046b3b7aa0da94b31e3e4b0896ab1b8cb6ebf8e. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/SEYOK1628277.