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 0x4c9fad79400d25f21fa86b92570bbead6860719a85a1e1de92c9ebb08496cba3. 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/0409adb4-6bf1-4852-a7b9-c49bff05e8ee.json and https://artists.proofprofile.net/proofs/artist/0409adb4-6bf1-4852-a7b9-c49bff05e8ee.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 0x221057aaa74a8b7dede10f3dd37b0deea4b1e7aa51f9566ac4db12611de14d2c. 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/QZNJY2431122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c98d2346a8a73be6050dd0bdeee93a0feefe397560e4265fc669b193863f43. 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/QZNJX2447956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeace76d49780de7689ed30d731067c5f402f8cd205be1a2a059ae55f53e95586. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/BXIV82475066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec75eaf0ae278fa4212ac658c66990c686542b1cbbe27e2c6fde5cfe2f98518d. 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/BXIV82482273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135eebf87e876b11f60856b99fed61f7d5c3ecaf14f87e7165fc7360ca9b050e. 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/ESA112439380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c74a82403b6172ad8b0975e89fe34d187b7c07fa1373da084c451e500c2009. 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/ESA112440174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2ee4c8b0558da63b35f86e0042b728aac0ba37ecc5daa04e19d38beb5bec30. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BXIV82462078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc1f904ba29bfdab9855050c3e85ae7cd7db060cf457fa9c2f30cd708e48148. 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/BXIV82468925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c65eda87a1ba47a42db0cfba6a738f662d2fec5055d46be720f04aae9b0125. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZMZ92426655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74efc17c89933ddf10d35f674825461d86f8dee51aa407f07a7726ab46f06b2. 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/QZMZ92418434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7c78686cf1b81d2fbbd6a084153a4d68f2fe2bf954a5f895a59c123341da90. 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/BXIV82497480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576ec4ee771308c2b22aed2ec9e7817e111211063981ea97d27392d7c9c9df98. 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/BXIV82414906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24eaf66e861163f3c45c7ea635460d38205f720980665e4776e2f881d05bce80. 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/BXIV82480550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a792be96c212514bae72fd40c5ab68bf9a10fbc73ee1ad52f146e47bf7f9cd3. 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/BXIV82466478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01f44c82381ea4119724f52613138b396b9e9663daa5e6bd1880733663ac7c7. 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/BXIV82451512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cba83881fb9490f8f638c6d7ea318b28fc89e061cf2c3cd3d6ab9aede5f1401. 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/QZ5AB2439721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63fa40d6d4954a9fcfa090b36fceb206c190bbd04d0123b5aa8b34c30810647. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FR59R2461166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9398201ba29d7fecdf025e1ef10f39a587072d82f22053a97fd1f7f60d4549. 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/BXIV82412278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab683697e35cfa8c2b703c763776ce4fc7465ab1a7780640e391d1522c7145a. 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/US7VG2450192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2105379e914479b688c8ef2bd7439be69ef97804516ea3fea3f0f1afc40dbef9. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZW9L2386587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee9327fade4e43bfc941b681ff99ed03d211bb64bd282ea5a1a3457201f3630. 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/QZW9L2386824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c109ec995a956b3e06f8503f2c9c29b9d09bfffe851cff8df906edb9b614d2d. 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/QZW9L2374227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2574256c80e58579670de91b52149487d9a8c5f35fd05838214d268830940906. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DGA0L2362954.