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 0x925a242404b4659df66e730af9bcf331fb15e3a2c7c52a3edcbf9b5148deed09. 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/acb64c36-288a-4eb9-8d34-ab6b8a81711c.json and https://artists.proofprofile.net/proofs/artist/acb64c36-288a-4eb9-8d34-ab6b8a81711c.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 0x44d367668778890773e313859e28e7967a706bdd1715d4bb196cd0000ebc4c7a. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/US7VG1608773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2758d3358ce9b710f3e33ec30d1cbc49cf37c0c1db6da48515b58c274afc265f. 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/US7VG1608558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b55693aaab0d839b0634926344bd71ac1e452ad7aabeb0a1ac639745f145c5c. 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/US7VG1608560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bafba06402d55a672c7cf8de3e41224a82d353944cc683e4ef7a583f725d536. 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/US7VG1608744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6392f1d9e9909b58c075046f38d83f33e96b1039ef1b8e82eb85b025be01683. 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/US7VG1608745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa89e8f828f468b805f3466054c373cadd3d9db4949c3762297543aac3f96e0. 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/US7VG1608747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc86daa4c6e02160c61145bb8733a4b8ed75cc4b1251c611bc844258a5ba712. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/US7VG1608748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d946546cbfe06c9dcc67e53765cada6a515b0d72c0a47ecf828a07f53088240. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/US7VG1608749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354c2271c31f262b0990317baaf79835d60db549b9a74ebb7d3dca0f60e9677f. 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/US7VG1608753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6301cca8ce0f1d7a873c89ef1ec27b87be61dbf1b8ffd517fa86d77fb13fa0b7. 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/QZ5AB2339878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ea39cfb28ac90d633f78a8cdef32d723c6ced520c4b605e5bd94386856690a. 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/QZ5AB2339879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a1e9fe771ed72550e24d9ac70a0937b855fcb77c6df4c35f4e6260481992ac. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZ5AB2339881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd37a2a110217cef17cce294207849c5f42115d98a8742e57deeab35ee9c4d30. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZ5AB2339882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3c94b0bfba835d132921f4d481860b419c5b967870af4cca2d898e71558ee5. 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/QZ5AB2339883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461180a85f3c0b45903468e303b16a7fc4f9c4176a3f1debcdb46037c831fd52. 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/QZ5AB2350077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6b5478406802fa6a5a4ecb251d780f202a78a2dde7fce3cccbbfc0be01fd29. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZ5AB2350079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5530075b712275dc498182b2199baa003a79dbaae3723b0e63008f608740b0d6. 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/QZ5AB2350080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68bd471104b373358307cab75dadf9b2df338aee1977b10dc3acc11597042da. 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/USHM81737455.