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 0xcf8a7dfc6b07abc2f0c732c1ac68385154dcd0fe4d925c9fb01144b2c9c04dae. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c4e6faa-0478-4b50-8cb1-e49ff7307680.json and https://artists.proofprofile.net/proofs/artist/0c4e6faa-0478-4b50-8cb1-e49ff7307680.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 0xcd19175a941646c9e085a61ecfa71554a238bb0fe0488e643dfbe0275723dc95. 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/QZES72524870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56c78567725d523b4dd557467fa0d89053506b577b1656cc06f5d4e5c23ed60. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZES72524871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1625143cc438926a154e5fedbdf6abe4bf9fa908aed5e977aa49c7ee8731f6c7. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZES72524872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9a2998b1f2c298b9ebc45d6710f599e1f22e9f2c1e3b8dc80d5ce37fa14ed6. 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/QZES72524873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8e1e84644c119b6955615d9ca0fdc84572ce55435ee7e8594b14f1e963b8b4. 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/QZES72524874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fb4193752449359573e832ddda86c01bf6b26c4870f764564936f7511ecd8f. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZES72524875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c7ec32fda25d905369d364a7b50afe30cac4ed14542699aff0d54ac8fc1a15. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZES72524876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89d09b17ec55d3fbac1f7018d8f457500854009425a7ddf50c0b50650a521d9. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZES72524877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1990043f572019420436b5e43c2bab8c26bac86e60c45578ca939e555e070d7. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZES72524878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9a6a6092b3e57496d6e96024720b88e909509b12f563bb13d1cfadb53f372a. 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/QZES72524879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97316f4db85ea88262f62b569bed0e217c60606dbb7edfbde1d27844c0d388ac. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/DEPI82505938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9317a432dd51f4e18243009236a39fea9d3754f99d977acad0edf03fa6799644. 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/DEPI82505939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ef390f66f4ebfadc0cf633aa407a6be65d467df8761025e0279307a482f326. 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/DEPI82505940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814e514a16d8b2a10c4630154ed3635e5edffde8ae05bc78af082ac027e5daa8. 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/DEPI82505942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a107bf005e981e913ee72535a58d45c80cd1393299d2dd90192a713ac0c349. 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/DEPI82505946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x359d98763e5d40227e9780943ce3f35e80b9633898b52ae68aa764d8ea69c265. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEPI82505947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2febbbd62251f917f74ee7e8e15a101f00dc1307ed4a037f91f70c6b19d617. 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/DEPI82505948.