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 0xcf09ac703fc5d8bde1cbfd06324225c69af2cdce48f5052369edbfe747a803ff. 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/4f2da9ff-c8ce-431f-902f-01eb62702848.json and https://artists.proofprofile.net/proofs/artist/4f2da9ff-c8ce-431f-902f-01eb62702848.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 0x5a2dbade9b6c53773b841eafa9d22fe2d8e303de53da3f2149142725509cefc9. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZDFP2078426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb0785a48e1344fc3393ac5c435f9538f44e47c4f3524c136e05873794549aa. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZDFP2084734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b9edeb2ae8a57dbdbb053680c4dc4e74342d95e0c436f9087f5c2b24847140. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZDFP2084738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6563f097723c41e60fa851167e16e18df199dd2ea28f512c260e93d2377bfc8c. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZDFP2084735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfc0eeec8d73b0bd566f65ff3d1e85396a5c28c2118ee711e4f0ce1cbb96b2c. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZDFP2086557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ca1499d75d4983c0f94da908755416ca9a3a27bf37f8ce8d97a144254fe1f2. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZDFP2091950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057d966447d836301f90a6998a528815357ee4a6c256591823e01dedfa377667. 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/QZDFP2098363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938ad4fbbbb63872755939207a56ef04bc6c8d12de97949ca23dfd5bf0941271. 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/QZDFP2103033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d77773dd605cbac2b7608d96e00f94b05411f5e6a0de94a00f0e762028f69d5. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZDFP2108190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d77773dd605cbac2b7608d96e00f94b05411f5e6a0de94a00f0e762028f69d5. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZDFP2108190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d8611e125d381757be1f0470e74fe48e7dce03b8944640944aed57e2d1a5a7. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/ES64E2463818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519ef89c166e67666dee89b7b09910720a7500b9935debcd6a924f1e5167546e. 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/ES64E2466448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a862898f24cf4f08b7db86247a4b7b5d3e84fd4fa3a1bc0fcc3394f641c5ed. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/ES64E2468444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf471902759b4f54207d1cb460d89a4e4d2278b3a2621e53be94fe4ca3939f025. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/ES64E2473809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6333f6aaf2dcc06203d9a6fda59dbfc7ae7f476a9906a59d360366120676c1fe. 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/ES64E2479805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4fc2b19f6952c3ec37bb141179dc31a4f415131038c05222f543ac930246cc. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/ES64E2484625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97ab96c1a96aabd399e8053e30c554f1b342f73563f602658779b3432c296da. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/ES64E2485525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d81cae71964eac8823034483b2029e10740b030b2ff3656d2516eaf50d12f4c. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ES64E2487594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210690db2b4a71b0167d8f34bbd037d518c231bdd0fb8a6c778b29b0409fb770. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/ES64E2487595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577945750b1286f107dc3431347aebca3efd573bbc7aa7e478c40a7ffa88bcac. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/ES64E2503941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1650c9debf804df72854dbf4a7e24f9e5cb387d11b55d35855ea06e047b42e52. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/ES64E2510019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33eb6f3e1756ad4b585ed4ca45689a46a3c351e3eacb22891f7540d46bab6054. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE6QE2402730.