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 0xe1bd0e5125f68929b6c0589ecef4c6410bb91afa757e9458fa58ec9b1a00916c. 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/23aa9312-66bc-4967-852f-3570bec33686.json and https://artists.proofprofile.net/proofs/artist/23aa9312-66bc-4967-852f-3570bec33686.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 0x5ce9067cbbc26ced43ae6e9b1d33b6629244f01478395fe47de866d5c0578ec3. 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/QM6N22244221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efcd9dbaf7a1dd2d2d53cd726639a02af053c1830b938784e69c85b28903cd0. 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/QM4TX2280668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a1c818e569781fd6fbfaf070dde37bc5cf1fb8744a0640cbc717c842f42984. 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/QMDA62112129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48eb36bb0c25565853eb0f0376067ff7b55315abeea7fdc9a8c7218e8a1a415. 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/NLY3F2100044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a78798d427256e2e6940bc0ddd1550511af3781e5388d870d144382356e68ce. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QM6N22183300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e21526a320fd7506f67085e7706c981713e3758fc07ee4dc8b8434164db588c. 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/NLY3F2100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f6c1deca5cac651cac8a5da1d8b52c50a25821a275dce75b2f222d1232a0e7. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLY3F2100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421fcbad8822fedcd7963282336d10190fbb261e2e35c12b0bb661646ada56a0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM6P42458082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc10fd991fbfaed86011111c955f47303c3a81e994cdf43357a7fbcb14f5072. 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/QM6MZ2440165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1f3be24204bc814e3150f8f38d94d350ae0d8b080e7cf917623f0f0a3a8784. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM6P42426874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaea239b116a5aeae3c9de50b176d0055e5f675d4ff79dca33d64d9e72a9b131. 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/QM6P42426713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c6d036376d6cab4d23a6401ba72323b8be31a5d46e71ef067c79132ddc7912. 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/NLN6E2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd305733d1dd9bbe4d9e3510042f6d91653ed86ccc15aab8f8419788bbbee5891. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QMFMF2344789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fe3e740a34ccb8911a1bb1694e2a75751a93aed06dd4e9f60815c676992294. 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/QMFMF2345026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4dc1cb183d36dd2cc159bf4886407e34c29a5b46a1e6d64e369ebdd82252b0. 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/QMFMF2345027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd305733d1dd9bbe4d9e3510042f6d91653ed86ccc15aab8f8419788bbbee5891. 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/QMFMF2344789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e91b1f3e474ba8702f5c3cd476438d5ac2b52e7fb4afc68ac1c26404df5ec08. 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/QM7282386293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1ba74e0cee1de448a5ee12958887ae01c3e8324dd7542841bf5a89ea3487d1. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QM7282386294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a56d4197ae892e654310c72b3706bc673d7dde73e142a62003e06c603b2a435. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLY3F2000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9f96de47078d8a50fc5768cf33978c1a02393ca9edb538878ed1765551e3c9. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/QMDA72193733.