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 0xf04086cb1d9af50d542595410a8274809b296a44ab9a01492211e72a80cd1f0e. 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/13e4a596-5709-490f-a016-9be41347bf19.json and https://artists.proofprofile.net/proofs/artist/13e4a596-5709-490f-a016-9be41347bf19.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 0x4dae9574fbde3988b9036a522dc7768363cf94b4976290091c8d8ce35922eb72. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZFZ22216645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8aacc1f408656f714ab4bbf8450d18eb1df6e932e9f506d41719f422c9206f3. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZFZ22216647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c561bafd5b70e132fc82c3b4396cd0b141f4bfb9f0cb1918907eed4cee9e79d. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/CH6542246107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9178e8badcc9b4586a604c3a78a4db8b05d8ba44e83f9e9295a1769f01371fe9. 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/CH7812350537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79821045dc53d562cca15b3bd3ad80615900903c44c3e56861c679e67391747a. 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/QZTBA2272741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6c8a55471d05741caf3ebe1d62a66c3e6596808cd2460812154a22ec6c39ff. 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/QZNWY2220199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20afc9dfb57cb1f3d8a52ac0816ba14fd2fe1b51938d4232283774e68e4f5b2f. 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/QZTAT2281602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93dad7f37fe361167ed1007526817e73d2dd3e90cdedbf6f519d8075c6e67402. 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/QZRP42206073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf01fe2ec7395622b671c579146275c40fe381d351fd557b978ec96129fc4b6. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZNWY2204115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1059ab57ef16fae8ad878b1a16566ecd9610331cd813cecfaac4ae7b40a66e25. 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/QZTAT2281603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6c8a55471d05741caf3ebe1d62a66c3e6596808cd2460812154a22ec6c39ff. 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/QZNWY2220199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938d4cf1cc7ab00cbc33bd1ef7500d8facb34a8f87acbf0665cd08b5163fd9d1. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZTAT2281604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd4a42505e8f63e2066ded359caed43616d34f6df8e29396f1d353c3a4cdb54. 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/QZTAT2281605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ece1f95119a1cf9c4f9ef1ddf92d86b7afdbdd767289c33fc10868a34b61ad. 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/CH7812225976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b8df048a0e822003520af9eae1f32a8ff3505e9e59c571495a0b239979db09. 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/QZK6N2112204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b3eda3aa3a228608912aea68422052c29cb1d7f4be052a7b32091fda1f1f81. 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/CH7812356599.