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 0xa6017e051d87ab39b446804ed8586c4aae1fdd1267d90c5e9e7f519b71a600f9. 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/cd1a351b-ec61-4a0c-a681-9fe04d78d0f7.json and https://artists.proofprofile.net/proofs/artist/cd1a351b-ec61-4a0c-a681-9fe04d78d0f7.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 0x61f31e196e453e55f8e405eb5ea797670e006f222d79d62f8c288f41edfad6ea. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZES52165875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f85221ffb62fa098de379071aba0149677ba9f40c800ebe24484aee571b333d. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZHN32149278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5b6cbccf68834eac399731ee617e4dddcdccc32497d5b3ea634ac39d78ebc5. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZES92266728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e6be21e8521d427779fc29c8f6bbdc373600bde273aa15b10bbc0e2dfa963b. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZK6Q2284782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de20083cb393e56e7fd86f01dfa0da172de258836b0038ea557a1ee42cd6238. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZK6H2267751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0711f2febdd432f79831d8a1e7db06143e42b1df71ea5ae673937c9a2693c12f. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/QZNWQ2277331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ef99b1f4f809108f260b6436c65f563568e6663f8a7ac0f84b4b2c8685ccba. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTAU2205620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f86899a83e4dd945614dd6899a4e2a54be7f60498708a59a4b7e0ccc06dd5d. 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/QZMEM2311058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14aef6496b9b4d1fa80458033b3d3902fe89078f80ba22f54feef29800c444dd. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/QZNWZ2311794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7c475b2c725a87ee0b47cda0284b9771822980cb1930eea8b9bb51c78d7eb1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFYY2484556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc3b0af00b3c7810402453042d9bfbab7b5c4e09d13022ae10736f4fe9a186b. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZFZ42474223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4921d2e333a1951bec63be33a07102368836047cb420c901324dc933e46d37d1. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZES92425828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866d77deac42715b81f39bd03908a9c7dc0ab1fcb3d41dafbd649b66afd954e4. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZRP52479163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ed6674c490a97ac24f7a2f653db6870aefe20df6435bc96e16ccc3d752deb7. 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/QZFZ32517523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3fd2bfc859606bbe44184740d3256d98f5939108c647a0bca45f710943309e. 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/QZHN32515969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f149f2948cfc5066a806e50796195e54bca3a784878f7558248c5560c3c0c7c. 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/QZMER2520445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477b6aa8866a2f9362787e5ea8212e412fb76908bd46867409f45b403caffcda. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZNWX2527910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35147a384aa0c749dbdb5b0ce6e74cb53932e69605c6e40c3bd4bde1e22703ef. 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/QZTBB2530111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f320127641970bfc6f2e072a7c0362969b9efce94f78685d0b7aeb008cbcd34. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT3F32561830.