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 0x278e1f7af9893955d6825784127b87903182f5bb3ffc086b0ead9f143638e410. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/69a6a9cc-98a5-421a-87ce-0d5e3730d492.json and https://artists.proofprofile.net/proofs/artist/69a6a9cc-98a5-421a-87ce-0d5e3730d492.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 0xa04a06693cfdf8f835086305e38beb09d15e76b07425870d587a8fc3844bc5c6. 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/USL4R2226708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84809a76ad4e2af15374353c142e1a86941aebf05001958b7c007ef46e4a7ce3. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/USL4R2226718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9f1ee1b3f8a81030e1d44a569f713a88aa8d921dcd9f46b03fa4b205c8d552. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USL4R2226699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f0c2323733a9edae0fd08931e5f85344b6f1b276f09db91c43070e4ece9328. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2226709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df026d6349a1ff50f10cfc127df2bca23a49b369c9d849451a444b7f242dc1c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2226719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5192264a15428f32c6c43ba1d27d36fe4478ff4ef0cc4ffd686ae1925e956701. 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/USL4R2226700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9c8f1769634d66734727801245d4d2ba57bb31840ed9f5442593d2d33da1f1. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USL4R2226732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9418b4e2a92990af489c0f6d1419fbcef48ef35f332bc65358f090f3f54a21. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2226701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090caa279f53bb4263a1ff2a1b6779e2d412926ca8fe167d643e25dfa348a434. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USL4R2226711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b8d7de96ba83ab514c9bd65a99637f32e5c5ed56c51f56e660011dc94ad223. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USL4R2226702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944f882592db72f74c778af4825067adad6c190e605caaf9bac4da1c1d675c71. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USL4R2226712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7769f78af55a25beed92d9de5e356321b905b1d0436743ebd1e47c6aa5e59ecd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2226703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4188ee7abd2e86b7b8321a37ef5378dd30f988c5d95d6989816363b96ec30d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2226713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bce9ae81631f1b4441088ba404da81fbc831bf1868ffdbf7bab0a81784c0cc4. 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/USL4R2226735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a88f556c6e02f1bea21b16f3e7c4aad49194fa8a2b0688906f9229b64bcbfc. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USL4R2226704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39039c613f01565ffa96ff88aadc385e2315927a7da861cf8afe6aa7a307eccc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2226714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2961f29dfd14313bd94f12ee45a831ab22bbf51c0d2a3a5d6128c479fd29fde9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2226724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377bf9eb9f797dd5a1d269d5337bb3bd271d2d5070e618fb6c2605cf884b6605. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2226736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a74dcb6b8186e0741ff7cdcdecb5b9c52f3db8c130919edf7dc36682299b05c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USL4R2226705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf4e11e7b6567130831f9a050d825cebb52f19033a88ad6131daebe9f0d2ecc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2226715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1c491d80185616f65ff13a29ac2e37004aa9d91ee5d2e047dfe16c9728a959. 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/USL4R2226706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa850151e80e27106d788220eaac130e8534e8db18358127c8e2094987d7c4e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USL4R2226716.