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 0x8dfc1e59ee2f423e11b6bc8c3617cc4185026ef85afc85dab5644f6b71262b58. 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/9f112839-a68d-4be4-b4cb-f8ce8e97df4f.json and https://artists.proofprofile.net/proofs/artist/9f112839-a68d-4be4-b4cb-f8ce8e97df4f.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 0x836dfb66335c9ebb7b01e07707f32a5eec18bd13723ed8cfb6693303bc2ffedc. 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/US25X2202667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaee05e7aa93fb8bbef8daa3783a7902c5b5c79234cf82af20590e36f0823247. 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/US25X2302316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf8455fbc28fcc62bbbd0a1351dcd6ea321afa6095cb6f3885b14b5c4345cbd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US25X2400264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6614ec466208b99d19c6c9c0b303e658f1c4c2b8f505a8a65160e7086c5da3c8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US25X2400290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b37a6662409fa2b93e0f6234306dc8b28f14805cf940d6ec71db622fd0ae5f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTB92421860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35ddfaa05881af745564f2d1656d1809d706962e25a7da935932fd9b1428769. 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/US25X2302179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d2b837b8594d029c6da42f7f31f6e08e47cf7a6ed2a3671d1791c1182e8c80. 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/US25X2204342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba71b29dd1d21a5590541fbb8cc2a92cc6b591afdec38c03644e5d8a6997856. 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/US25X2302183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d2de02faf48b4a635a88f699ac313d0e245320004969715a4e76bfe64565ad. 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/QZNWT2490681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf5d31e357f0ff4999d1f3eb87fcefccae67d671f35f7c0b17705acf8ca89e9. 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/QZPEW2428512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24131cf206121c8e6fb1ec6c70ad2778ad7bb0b17cdaf499fe03624406b0e9ef. 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/QZHNB2429947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8e6e1b86c63d1e0ecaf360e3a1d6fe99b03c5a8314906b82baf66baf7e6201. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTBA2329006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3155e69baeaaf82bd872529a3114c088178b484796bdae3c36054267271e4baa. 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/QZTBB2356442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c8411e11cacb2d769f59225ac38b62d3396300d369e1a5636f6c139b3fadb5. 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/QZTAY2395183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c59d6f622c46ab80669e681e0d10305f4b87c9b738577735e0a26e6d40a010c. 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/US25X2203927.