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 0xe8977ef7979811c38ca82b9cfb305d2d76a4142954aa6ebd1a309130d7388775. 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/1441b64a-5cc5-4861-a1ed-b4c8f5f70c52.json and https://artists.proofprofile.net/proofs/artist/1441b64a-5cc5-4861-a1ed-b4c8f5f70c52.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 0x23f893892564d7faa6d57f0213f548c72fb10dbd8406d421147329d9749f94b5. 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/QZ5AB1623968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff928f36fdbd6fc6c9f2189eec4a93197eb521f1fe17ccd3b931a949b5851b8d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZ5AB1623971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982da057b5faa24ca31b9849a4890289ee0ee88a67706f2dd2311a11599903f4. 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/QZ5AB1623973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481106c26217346fe61b47ac01afd4750647957082b2582b3b203cabcdf83d9e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZ5AB1623975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ada7a2bf0acf61c7fbe9370a26ca4cd971e3eb7ba2483b4e835fa07eaddad58. 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/COB191800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22984c85a1930e5ac58973041b12cebdc213a794e231c9e0b8362066fb55662f. 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/COB191900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38f8ff9a8f8d4c999de92abfb1af59caf1e2d39fc5e8a780f9272cbe08455e9. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/COB191900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61292181b7a5b5f0a7c4f244d6095c6fcbf20eff80fc435ae09becc8dabcf9d. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/COB191900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880c7446fb1902aaef88daa44d5eee44b477bf32dc72e0152b5c215576a1096c. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/COB191900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b7dc5af9a4b61e37bc81a8f69458a3c3f514f32dac9b7ee763b0a5eb230df6. 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/COB191900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fcc8f668a5aa4dc40989949f22a714ba2cd48774bf7a70d8f174d800c48e3b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/COB192100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ffea30c53bbe8fd00343e5ed707adbeaa944412a3a0fb768bbdfa42f865aea. 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/COB192200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ae110a59b51e9be6264cdc78e3f24148027a4b13337347b172b003b6cb498b. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/COB192100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a2ff7fbb554ffa570f0d3d44c074f08ada2483875122d4c67b2113e78b75b2. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/COB192200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515dbfc66f1d2ef89b8cf70d3fbe7fc610b7dbf3461b1cd0b50e600fa2b01476. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/COB192200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a19dbff6536d1f0923be9676a931f266b92cc9830cf1409cfb01f4f6106e8e. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/COB192300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ffea30c53bbe8fd00343e5ed707adbeaa944412a3a0fb768bbdfa42f865aea. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/COB192200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f18323faaebd95d64dfb8136eb0dec1a8b9a0aeff28115cb97bdccc3ea393ef. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/COB192300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838e4b0fcc674c8a169b9368b573bc0ea98bc8112e1dba0ae94d5677731a9e41. 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/COB192400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05275b62cebe30f8d9998e6f2be7c0aac98562eb89a284b649f963c23c1297c7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/COB192400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05275b62cebe30f8d9998e6f2be7c0aac98562eb89a284b649f963c23c1297c7. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/COB192400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f18323faaebd95d64dfb8136eb0dec1a8b9a0aeff28115cb97bdccc3ea393ef. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/COB192300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd17e714d1af7236a53a353e5256ede80d92399975f7a56e5dcc5ce799a6f82. 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/COB192400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf456ce2560f52348b0e1b0f87a3eb0d06f5a787b56464dd3251faf51a663a409. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/COB192400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd539126df32afe28990bf59ed9570e22b2ee940c0414a9caa72e51cd78e484f2. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/COB192500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c63ed90a8fe20f4eeddfbaf74cd275db4c80433baf8b24a41b535794be4526f. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/COB192500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf456ce2560f52348b0e1b0f87a3eb0d06f5a787b56464dd3251faf51a663a409. 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/COB192400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0cf8307ff73262824b0b2f12b45941293ceaed4256a2a7dfa1c9ed4e2a8c30. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/COB192500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71a370b2efa5f3fab9d5f2e07d74d09855fc704342e676848917769c1ab0333. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/COB192500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a5adc9d69803184d2ffebe6cd7babc8484682ae8da19c31843cd84a2eee72d. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/COB192500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5567668d6356e3edb050e3ac531d6f766059dda981f78fa35f4186b2743bc18a. 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/ES71G2310303.