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 0x755b5f0cdd73111c4492fcdb9e20739a549db9959345c38e140711be49b048df. 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/b4b9e836-f31c-4053-a35b-8664fe45fb01.json and https://artists.proofprofile.net/proofs/artist/b4b9e836-f31c-4053-a35b-8664fe45fb01.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 0x9699bad1ad38a1c26aa0defde317d87ffe1b1b385f382da1965fe2ad2f87c0b3. 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/QZFYX2385652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716a01ba6fbec4af72ddad1300e3fb7e5389c901395f4034104f7f0247583795. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZK6Q2367439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39a00bb5723b5e5ccc347b621bfd6bbeb4917ca3edbdb180ee3db3069c953b8. 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/QZK6Q2367441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fe376eede8586a4103eccb15f9074740f73bccfa825939cb93204694d8ea3b. 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/QZK6Q2367446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff2c0a32adc16879909983361aa2640cf3e10ad8c0825e6b5a274fe4ff0ce94. 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/QZK6K2348485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15d2dff7162a017a8651fbdec76ece0e9017713c4b20df0ae60f9091bfa1b93. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6F2339698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5693bf7108842dfd71f8da6f9452f04fbecd80e33e1008008361ce7f8a27718. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZFZ62336032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f8f5e9c07884c15b159ae1a7a2ca6192b1ded9c888584353a4859682769f52. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNWW2339002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c689d393ab61dc13f5cde148c3b8f00481f276864a03793e8f0b8f06254732. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZNWW2339008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6785488dfaef6b758cba56c58c272062222301bb56d53fe78d0b80d6676bc6. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZTAS2355994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ced87ddd86e42a48ec7281233a4b1612fffad1bd894a91e006f9ba2eac94ba. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZTAS2355996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5393ddd48ac5a55aa22492295f2c3d81e4f7c720569062ae333f423d913c2351. 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/QZNWY2363696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a415f080dbd81510ab428b345656590889378eb1c87a4cc171a3ba7ccc022e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTAS2355999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd49f126c07a941245f1d950946bf1db8fb0ee2cdf24bd83c4c047bc74ae943. 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/QZTAW2375844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b6003a82a758d84331db99c8113631c0ca83f29730a52256ee7e4c1a78ddee. 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/QZTB82320203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bfd2fa945a0e5f756cf225d0b77fb2ae638d45cfe971df5747dc2b87cba313. 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/QZTBA2301048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03e18d37766769442ceb49b39192694cbdb315ecea7a1d0ef6ad6541e118814. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZWFJ2384705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3d76a26c260f744e0826674161dbf31e24ee231b59373e1668258c18268e64. 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/QZWFJ2384709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a0e795366b0047a48eb788bc74d85f7a2d235c359362f95def1aa1f94ad232. 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/QZDA72479938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d11ada3eed19c1b4ce1835654fd36782e46ed39017211ae74789c20b9e047d. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZHNC2488874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542ace9355eecb7f2f8425ddc67d9a9464e05fbd7306f9f9e49c4c6289b2af64. 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/USLD91771241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b614da64c66e79ba486248e2f07e9bd8fd5153f98b78e7a9ee10d5be2a73e76. 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/USLD91771245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043bfb87e40ff559088ff59e9722b2a3cc1f807c569b0c9b7409019c399a83d3. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/USLD91774928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e837ce26582fec732749d9c7dc5d43aee1441f65e12d257209714199a0c562. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USLD91776312.