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 0x1a5445a28f7406e2ab138b7d355698413a5ade932581a24a5db4b46224dbe404. 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/b25a81b5-959f-485f-9b20-bb818247edff.json and https://artists.proofprofile.net/proofs/artist/b25a81b5-959f-485f-9b20-bb818247edff.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 0x595a24c92ef92ae50f5c074a96cad88bd1034009e4987c69353cf5d3b397ef37. 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/CNZ501600742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bc6997f438150ae507ac7cb5e094f2e2f2f90ffad4f8948449d239a191efd4. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/CNZ501600744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d2907cc1c90accf81ea2dc598782cacc1f7e40a53120499e98f75b02f4b585. 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/CNZ501600736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc197b5a927a995285770c66af7bf3cc512a9963e5a0400644dfb71c86387c61b. 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/CNZ501600743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56318ba5507fc0c8009790d22524633d42e200a786fd746ca61830477fd5c453. 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/CNZ501600737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab314e98e0caba9b94721d20282695c39a503004ea5eca4dc7f5bcfb2a99fb23. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/CNA792000541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b322d42d2e296ceda3ec733fd95038bfdf28cf6cd6e8412188bd672ef1a5308. 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/CNA792002830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410a31e9878b492214b75519ade9fc8369c49c92ddb3e61c15e52cc4966d5f66. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/HKG732236719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1850ec662c4152bc0ba798f291b6aca8340d79294f9ae0a206b104f82e11ffa0. 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/FRX762313458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b78f6ea5cab92cdfe4c752d4e968ed2911ce6bcd649ca69a1569ecab1b6a613. 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/FRX872332323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf087823187bedc28f079b8dfa39f479a761db04d3e4a18dbf0aae5fe18a424be. 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/FRX452340699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd78acad979ce933f47ae528518ed3cde285e3793f19c2e7ed34be39cf32ffd. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DGA052306438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf929497d4223cc6288792e876c19369972cfc96cee9eec9e8a01252d9e26557d. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/DGA052306441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57b031367418afa3dd6bb0776e5251e014f420b476193b47515e8b7d58b3419. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FRX282396928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91efd814b4c5c91a79e484235af5f76c2fc4475240c8e783af4750578359b45f. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QM4TW1916541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79e15610643b94ea191cf023b965e60a81d0c4b01766f3a707a84833d3d96b6. 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/QM4TW1916545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4378baac032f1dfe744a46c94cc4be6a3a3a2c55c52518f77650ca1e166e22b9. 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/QM4TW1916547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5da23fd39dc04bc4e346f74ba711542aa164842f1b5c908f9b16335a0d58ca3. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM4TW1916549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be30fbc6d1103ad6726af9201379da1a981e619e72fdf717d7dfefc2d28916f. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FR2X42158543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e33c8f974b535c23e141cce8a343ba765fa7628c2a44b7417b599199397d94. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/DGA052300299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364a4527f8826581593605f5144335aa15145d93bba4799ec6e7f1e898a4bf41. 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/HKG732240158.