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 0x88e2056524b4692f5393aef33205603077158174104713ab44a04907a7c65666. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8776f6f2-f521-47d2-b603-7cce797dc880.json and https://artists.proofprofile.net/proofs/artist/8776f6f2-f521-47d2-b603-7cce797dc880.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 0x9834a8c2c5675a18ebf6adba9b68a87df86b40cecc6e42042534773800938eab. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FR0W61328945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7fd0dfcd35c8db3c135c50dcc4760255db2d46e17d4ee3cf0b5a2fca981509. 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/FR0W61328947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da25526a705e13d19dbb666d3f267a0253f823579612d821160d385e294112c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR0W61328949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc64805498d3368aec68a82112af8b36617da8c01ffeb190fedb9998ccee00f4. 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/FR0W61328951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5b23678b53a8e356686405387a9c29048a7efcb0b2ca3a82bef5d0fc93c59a. 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/FR0W61328953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2895bb76b0fc6973fcf041dcef0611a6d8fdb835582562e17e03bb4643f6a2a. 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/FR0W61315680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113445bfee35e7e9495f99d46c00261ee7f2f329664beec7bc0e780ad03912fc. 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/FR0W61315681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6656227dcba412a9c5545f1c01c1bb76bfff409de2a8025009dd855cf42d5d0. 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/FR0W61315683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea56e1b942ad5ebf98f8661b83c479458dada872cd0ddc72ffe129b3eee1630e. 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/FR0W61315685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f7ebd070b62ceec937508a1d7c65f8f23a6262ff918a1d137ca91394ba27d8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FR0W61315689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c259097981dc8f3084c600cc9e68a42812f6834674d94b92743fc95ec5a210a. 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/FR0W61315694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592e6464f7dd78e7ca261c1e12bc919606095cc90f3c7153f8db4435064ac17c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR80T0300345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666ce6cbc25de6928c2cf06be03f85d37c11ca5035c860126af3f5e7296d9275. 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/FR80T1392816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfa67936d64213138875e5bc4a477d95784bbd36668afe7382b1e72e98fbf40. 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/FR80T1300816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7a63fb8607019e015d90cc1e0dd881a339c0faa0ab18433726a7df65fd809a. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/FR80T0000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5c7bd2f0989747be12fba0ef7c1ea16324b5ef158941136edd16e4f567a468. 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/FR80T0400556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68313cbafb5cd5cb877070b2cc8440d4737fb7a2227569ec58cc501c9021d5f7. 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/FR80T1700766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409be9003cd55e24fab4ab07be1fbd4efcb5ee6902fe3e47244b52016d2cef36. 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/FR80T0300281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2566edf2fc23a76dfb86099b92b673da7b61ab88e9aff4202e7a4ff5c5107a68. 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/FR80T0800746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446334161fcc8a383b49bc7914cf6bdc2b08bb39f23ff2031f19febdd3aae5eb. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR80T1600056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfbbf072446e9fbe75c5944d5c1cbd7f3dc90d46a6da26831186c79f51da823. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/FR80T1200414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842d46a7a29d4e8b49c9a1819c45205a7dc62266fe7d0e83b464d07112294dff. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR80T0700363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb147c84e7bf71953beb15d8b8a9eacea115f3c375b20ca5dc65b044795f16071. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR80T0400367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae416590645254b10e785435ebdabc61b5409ab3ecfbdf8697bec1ec98ecab9e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR80T0900111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79f1ec41da0af7b1d80b73fdbf4280b1651b9e9273d6898d4269be3bc4cd796. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FR80T1300492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefcf4fd3b8a18767cd9739503e3604a376225e65a954d7a0241bdf1dac54bc86. 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/FR80T1392604.