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 0xbd61d5cc4f9ab3d834c030f76f7a3bb348cde7e431275fb48a170c6d2e15621f. 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/83678d8b-5ec8-4356-a847-0cd4903ab3e2.json and https://artists.proofprofile.net/proofs/artist/83678d8b-5ec8-4356-a847-0cd4903ab3e2.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 0xc29d614c1a25a5c0c9ee6e443e5d0cfba8b5ac0456fd3ff64db7778c01f15947. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QM6P41871351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b42a407fb7ceb86a970a23ab39a80f8242892fc605a7cedc65d88d3a04d659. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QM6P41871356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafbb08e296ba72fc23fed73733fbb3e15ba2ef1698aa16cd4ce6db7714c9d2ca. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QM6P41871606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb11990a94b09fb621a6d07762d7ddd050c523da2fb71fbefc23b986fe3dc36. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM6MZ2549733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c9a3de2eb2848f312ddf9a0d89015ecf5cfd9aeb61050f9b8e2ab9d50a94fe. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM6MZ2549735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27db99be7c73d4249708b8e92b5844f1e11146bfe4acad5244720af58705ead0. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QM6MZ2549736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dab99d59ac06df26bb30e176f18758600d324539057d1957be37114ae9a53c5. 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/QM6MZ2549737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3bf1c2fbae0ece9c9040b91ceb45eff9bbd186f004fd805e39ef4cf1a808cb. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/QM6MZ2549738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc267526894eb71fb52e53eafaf105e2aa4bfa30db0c5db40f2ccece63d05ae6a. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QM6MZ2549739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c398a62e2bc649236aa3485996a8fad8aa9f5665a68822c7cbf3bbc9025a4fe. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QM6MZ2549740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2957cfae147b980b60021b20b39d84397666a5a2b5a686b9356c692c5aad6f8. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QM6MZ2549741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1489d6c32d268f18d7edc875f06dc0121ae09049b7af95bc4a547ddf16ef59. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/RUA1D1828141.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199cf518c5c6a00c6f2adbe6762db89ad1c7fdc50f1e94ea93101465ded682ae. 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/QM4TW2289717.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0504b05d4984517257ccf115fc388aa8af63084fffdb64b29fd44055a850318a. 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/QMDA72315726.