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 0xb114933b4bdb3754f4bc605b465e091ac5501436b4bb0a57a3163358045c8aa6. Chain 2 (Bitcoin): anchored in block 953889 (2026-06-16T04:57:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d5edfeb-5645-463c-8240-1fa27bf12f65.json and https://artists.proofprofile.net/proofs/artist/0d5edfeb-5645-463c-8240-1fa27bf12f65.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 0x7ecbf670523cf88936c775fe1836d9c7df5658527ed10698606e524018beb147. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZMEP2416860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1974eb36335b7363e68cd5aa3bc176e45c46927934f5d7bfca8800c1c3361107. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZZ7L2427813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0e816374a4dedf9c03987d48faa84bf920960ff1cc1f3b9cede1a4746b8e87. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZFZ42595339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef319bd2bc0bbbfcd8186df0d4a5ae71f17628e64fd64750fa8c4e88f49ac57. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZMEM2546616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853069cb080f9197457c497baf9663d8f9ce2ddb6f4fe0960b6057d854d1ca6f. 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/QZRP42507419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd66e9cf27474ae53d01a9b5587afc3d1a4c6002ddb9e1d10f97cd98af6cd44. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZRP42507421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9914f3ecb03414983995e3c7f571afe0796f0fa18fd148b859f45119eb69fd. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZRP42507422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0e816374a4dedf9c03987d48faa84bf920960ff1cc1f3b9cede1a4746b8e87. 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/QZFZ42595339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef319bd2bc0bbbfcd8186df0d4a5ae71f17628e64fd64750fa8c4e88f49ac57. 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/QZMEM2546616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d95849b4ac8e77b4bb2ea5f7ca35247bffd4179ae6c8ac571762dbb6568c264. 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/QZRP42507424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e47ffd24078307e6c119975f64881247485cbb710d9fcc7b00b2d35f9899ead. 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/QZRP42507425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50927c2ecb03cfd52789710690b3cd4862fa76e8dbf8c533498a58d05833e350. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZRP42507426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653aa7ec34ada6e5ae3389e06d662abb0689a01b72d9ffbee699c69dfa78a987. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZRP42507427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e72ee2d0a62d71d3616787c264173416b1dd007687f900f6beca694abbbba0. 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/QZRP42507428.