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 0x48737ea7c98caab803ad6d4ccbbfc00080f05d6c871e30d773bd96a7246c8b6f. 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/c27a50dc-4080-47c1-a091-5b88e6f2957e.json and https://artists.proofprofile.net/proofs/artist/c27a50dc-4080-47c1-a091-5b88e6f2957e.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 0x308f392689e7b879eb568068ede1e22fc5d5212c7c9e601fe8370d48987e6893. 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/QZWFH2329538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e719ef15c36fd2decdb63ca272aba8d134bee4d8ff9a55aef03344d3229172a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWFH2329539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94340599f4928805ba2e7da66affb8dca103f6a1795507157637b1f12554162. 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/QZWFH2329540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f786ce7b348bf58fc7771a6c8810b9e440e18a6060bbf7ccf13d7af02fee09a. 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/QZWFH2329541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78cb2363a54ecfc3265266a10f3f5e695fb795149926589f48afd75864434e4a. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZHN52455075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a98a49e02787817c648d55c3c485086f4e0554134229d69c9902b652707b56c. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZNWV2416961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9217a12ca509d32815b78c35d4e2b2951705f01d9239c5e39b200ad556ed96d. 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/QZNJZ2475684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811c330285102381eda2cd600fcecc977f4ef4c95954b7329d954d4df8385305. 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/QZW9L2414180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954a617ff029db46764552d525a38165256173fc0d128b1c55cc692298848291. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZW9L2414181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0754f22131e2042ed26fa2a8d25b10d1b861817b6c7ac5a271a674e4e3434e6. 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/QZW9L2414182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf580bae4532bf5d4d2d01d509bdb1219937c15aff341b2ea6db1f6d2dcea49d9. 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/QZTVM2485369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ceadfb481b701f00300ed20bb852ba23790e2466fc55497fce12146ae0cbbb. 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/QZTPX2455129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ea94fb35b3074d1990e2547e98a5ac71c0d6808617eb7c99f963683287f1ed. 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/QZW9L2414185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b14c5356ec999de2ff5295f4e1343164f87e680867f295a0c265fea23d1d73e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZNJZ2422087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7fc81ea37f04285c4a1a116ef206d6d0afefcce8332a1ffda5f40d5e84ef4c. 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/QZW9L2414187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f4393a26c6b239a160c30fa0919d521c1877ee73bf3585fe77b5d7f5c4063b. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZW9L2414189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dde0cb38c1d2b7f256a973221656de5eae648333801f1aade16b1d8d5198105. 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/QZL382543264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d3c7ce98d87f64e06fa122173934ff88d723fb0ed6249bbfa3acbfa698d9bc. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T23:18:22Z), 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/QZMEV2593765.