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 0x8a3642f681ab28c9d6edfefd98b3fbe49311e4ae4ef030702390c88f7a7bac6f. 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/a8988108-9a5a-4f9d-a264-9255db273523.json and https://artists.proofprofile.net/proofs/artist/a8988108-9a5a-4f9d-a264-9255db273523.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 0x81492fdfac2c102e54a34a1e73eb3e952f4b8b917212e86a8ae2a8c8cd9ddcc6. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZTPX2393767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ed1d45c8b63f16bd70c6220a1be40dcfbd6788923816d85855afdc7ddd025f. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:11:38Z), 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/QZTPX2393768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf4f7e22ebfa83c6b7fb7fb19fe4889437557c66fc70d78c35735ee04214a2f. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZTPX2393770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0732e53cba9a804c484e65b3689b46e07d38e475d57b5e4c93eb822d4d397ea0. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTPX2393771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f5bd2d2541189cb08c7da8a195fe50f302ffdd930bdbbf4e0819be602765a5. 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/QZTPX2393775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1b64cfd6c6f0a5014a8e0bf1109f86d8ced5810018b2802c92b614ea8dea67. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZW9M2338514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4601ee25e05f877404311cc2b3a7ef97b362b717902858cc17b9bf336f64d988. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:39:48Z), 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/QZW9M2338515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ae4a05f47ffb2c461cdc74ee9a9a8867064aba3e3870ede994ad50a7e3f0d4. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:18:48Z), 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/QZGLM2489985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605c0da908f4c3aff94da5e7f6ed7a4a6fb37db866f801ce0a3b1cfc8177d2fa. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T20:01:42Z), 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/QZMZ92443040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44833d97f52503397661fcaf94b545f9dbaab0987a84a32b7f7308e82b82a19b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNJZ2435721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b666d2a9b087fda0792abfdb0cce900961e2f85c8fc3649ebfdb9fc0cb67e2. 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/QZTPX2422669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a773305841729582b5b09c092a506744f413c5c0610808527765ca4e20f0bf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZW9K2448413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5659e13da90af75c70a64299fcdfd4bc11d4403738b527b30cdd95aff53347e7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ILTON2504518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ac2ad28875fb6f64b8753f2cf5c84fd34b67bdd87175a3cfe048862c02d3c9. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ILTON2504519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c7b82b3c823c8294ef391f8262b1dae66135bb2e128467746718591f4a0555. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/ILTON2504520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443cb152025f6b74459933d173d2a623c360435942dda364f1abc34b29710c15. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ILTON2504521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3096351fe877e9bea236e7e0bdb910217c831c664408b55f1f2a62e94fc61f. 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/ILTON2504522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb244c928dbdbb7bece04a94ec4c1948e8dc809cfbab6c6ad89852bd887f624e. 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/ILTON2504524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e3b48380e55b9722e35863eb535b33837dbfc2b5fedc99e4f63d8be547950b. 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/ILTON2504554.