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 0xa504e63b17fa91d724c50f8318f42176a543777dc1179ef1015ee8b7284a726a. 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/f78c307d-d649-4c44-84f2-185333e78a05.json and https://artists.proofprofile.net/proofs/artist/f78c307d-d649-4c44-84f2-185333e78a05.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 0x1d630d23a891fd3398a7478286607164dadf327e9ff4a2dd703f5f56ef1a5d7e. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZMZ92524953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1121f0f80d50f155b5ae1de0172f0f6948ee82c68b747d7a094c7d8951d19642. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZMZ92524963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3131f4465afeba21b74cacf50f1b9a234f778e56085c291d776d27efc2dc4cac. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZMZ92524964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fcb75b9bf7e9c3bb1bfeeff1071640390208887238cebb2245bf0024795fa95. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/CVA001600033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf8925c03fea22f2ce68fa40a366370bb3c115ef2d1e95f0588b492d9062bd3. 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/CVA001600041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423197253f30b1437e2eb5f258a5f573b498d81b0a0ed38b8fd24e2ed9021480. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM7281873978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08de4077200b4c66e3e988d6c6dbce916d3e757a9c969a1d46179d2cd7f8fbb. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CVA001700142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2f1f17f6a5823c4c34b9f206d31cdd38a62aa85f1f56afc2f803bf59d7f2ad. 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/CVA001700141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1aec56d4e23de2692fbf49cf73b6ff3936f443c1ed6070dfa868809c756ec09. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/CVA001700144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08de4077200b4c66e3e988d6c6dbce916d3e757a9c969a1d46179d2cd7f8fbb. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/CVA001700142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08de4077200b4c66e3e988d6c6dbce916d3e757a9c969a1d46179d2cd7f8fbb. 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/CVA001700142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58400ea2e0e95fcb320b6f648abb32d44a77d841f001b1de18a8f43fd7d2c710. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM4TX2000459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05f01a109dd4ec6a665dccaf5389c01da41eb3bd51157f58bfaabd86d06a689. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CVA002100328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc510d7064def2613b3c230c92d07ead4c23979e89f3f7e7dbb5883876d16836. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CVA002100366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33c3be4b9013d55065f27e9630df5e78e272adfd407390ec93be312a05c6f84. 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/CVA002100372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78359e15f8bcd942d38111869ee5e9883390f0cc30b33dec40038003f57ec9bb. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CVA002200381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b1b4e2e00292582cca9afaaec980474ded95d56b580720cdab450f81a80347. 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/CVA002200414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1914e5bdd4309c86d156e01bd93a9026d569a1294e46a74a27591999fbe6a817. 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/CVA002200423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4e63400e2e85b85d647ff52129075e2efc63f9230d449d8dfb9999e029fca5. 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/CVA002200452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb39235fd8457c24890cc3993f2b1e6cc66c0edae098eb3eacb39e485b955ee. 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/CVA002200419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b4d2bc56cf52dd14185d8ca660613a8fe8c7ddd486592fd0ff31ecd7b13a83. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/CVA002200420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c02224c6bdb62a1326e239e01a126fcc8e0cc3fede7d3eb81ff6efdf19dab4. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZTB32226760.