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 0xb4ff293e502ac2c71739cbeb7082e7e3d83d31454e7af40a395273cd0da33e05. 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/8213dfa2-0a1a-4f5a-bd79-41a89b62513c.json and https://artists.proofprofile.net/proofs/artist/8213dfa2-0a1a-4f5a-bd79-41a89b62513c.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 0x27c6e7b63b4d62b9f91311c4f0bb258a317bb31ad84f2fc1d3a70fafcbe0e554. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/USDEA1005401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b476f9baab9a8c8ce3c89b3f0b18d0f5fe98eae890478d6d7d775453976c35. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USDEA1005402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fea4ef73d129d28dea20a096c7846bd7963067cacd4c22fe84ebffbca67df8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USDEA1005406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb10f9ffb0282a31877911c4f5f0de52359b49fcd5c1570c4a06b5a8c396e8f. 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/USDEA1005408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88035d5a8904274a207406edcf526d64db5aea66c677676cc8b82e087a3daf1. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/USDEA1005409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647ca9a66b59b45d7c971fb52065b326551d18de6a1f01b033f529dd1c00147f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USDEA1005410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b476f9baab9a8c8ce3c89b3f0b18d0f5fe98eae890478d6d7d775453976c35. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USDEA1005402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fea4ef73d129d28dea20a096c7846bd7963067cacd4c22fe84ebffbca67df8. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USDEA1005406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8885775db6ae839ec08886cb2f928230347dc02513b58719b7bca022132216. 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/USDEA1005407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647ca9a66b59b45d7c971fb52065b326551d18de6a1f01b033f529dd1c00147f. 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/USDEA1005410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181a7cf349f9c1380e521e98c3fb0cc7b47d03e0a23001a463f8509dd1440574. 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/USDEA1917701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1571daa95d758333835f49bfe83fa4fcde64693d24fe32ad4c3cea1f69d950ab. 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/USDEA1917702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1c68db7c274a1423acfe43b7384a4ec56954a711003ae9100a14080c77df00. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USDEA1917703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb570ca660a5f0602697320514f81bc55ef072a15e9c7d777e3a3061c47ea5d7. 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/USDEA1917707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133f6ada83ab8b787f27ded577f03c46e3cb4e434cd93ff71346022e60d26320. 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/USDEA1917710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c50d276cd17e8f41ac27b6af9aea0e5460eb8fa8136fb0918b8a9ae9e5c25e. 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/USDEA1917802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3b95d03b0f09733f0203bd356696aba6e1f23bbf98e3a9bc9802a95a6347b2. 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/USDEA1917805.