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 0x060e30214fe292fe2d02b12950b489fdcd12bdee1e68d88af799d45b5191a307. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bfa770a8-8769-497f-9c29-a2bc77ca4626.json and https://artists.proofprofile.net/proofs/artist/bfa770a8-8769-497f-9c29-a2bc77ca4626.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 0x1f04cbcf95a5dca92b0d158be4fb3657938cd016618247b9e9a0ad057d470b1d. 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/ITK3N2400701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c16c2c7e9a12c1a28e55a65d40a14cc562d8fec47cc2181e7cccc489fa5489. 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/ITK3N2400702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f15b2f57a1e43087d3b59dc538cd7a95811d5fa35a91e4449e7c196cc0a74d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ITK3N2400703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6511ff5cff0092ec7a93d139b9ec871c72eca498dd73c8a44f949f83166331f9. 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/ITK3N2400704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e857dda0a9f9b84c9566343895e037a97771b3c74a58f91fc26f736ece0986. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ITK3N2400705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc3dedfe8995f736adf5ffb9d37436e763e6ed8228e936eceebda9dad92c3c6. 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/ITK3N2400706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19acfde885bbe63a63df760bdc3383e780f8dca68e3c60b9b2dc7f27ce1c1361. 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/ITK3N2400707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcf228d307f872be2914b6b23a8b8499490e09d0935df4303c218a6e7a5bbf5. 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/ITK3N2400708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39cb36412d5bf26e451debf95bd035f25a2e4947bcd002fa4766b02d998bdbf. 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/ITK3N2400709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f0ecb6300733a8c785fabfea47a8182963fcb08d2d674965a35632075d59f9. 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/ITK3N2400710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3cd2fd97702864a3ad2a37e0799435e984cc3cd788b37c3a7559d01a9d2e12. 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/ITK3N2400711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d4dfc6010d6814355ebf87d9c2e36040f2cd0990c7343b23c7d3212ccb5cab. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/ITK3N2400712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72532021c46f6de5f82a007e9461f6ff76e5142435c8b996bc1d6e64208973f7. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ITK3N2400713.