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 0xd5ef455d06a92ed0abbb1f3a48fba2609a39d64c38d2d682ffeaedfef5aae61b. 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/e65dc892-0ce3-4571-b9a1-f347c90c46b7.json and https://artists.proofprofile.net/proofs/artist/e65dc892-0ce3-4571-b9a1-f347c90c46b7.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 0xde670e7fc7a8a05bd95c7f43981b8afad03b15a034f2fcb5625faf02a94c8457. 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/DGA052262841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ddc5a06c00c3ef1ea67b504f2cc84034107028aa4d58a55688071821f3695c. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/DGA052262844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebef084cf36572640f483bdf1637cb599e31be4ee8edf75c14b13e23134e3a4b. 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/DGA052251796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4110897088da498de80a36fe3f9ad90d348a7047676bd3b8f3ec3ebf84a6fe29. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/US3DF2235969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e0cab62c889cd9fc7d066d2a23a0fda28af7644b9774928eaf1abfdb4dcf0b. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/DGA052256082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f55c17b9b756f656c640b1b74d0bc7e0afea83fb6901b54d4fd22bef2fa7fa. 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/DGA052256086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57c4647c79d85f727b24c5edf5b2da462d5174d04fc27d9c0ea8ecaa8364399. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/DGA052251808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b742c73fa535a82d428b824ef2416b79fa55674a4b8d8efb71deaf479fa8ad4. 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/DGA052256596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf559cf324519ab593e2a931877754fa841df73b7d4933044842e4a83f4051f69. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/DGA052256597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f397d7580c22bb2979477823282e98e7f78feae78dacbc7baade3707714e5f7. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QM3DF2176616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed727b6d0306cf57f66f7f16c3d41d5157e1621540fefa7cfcf8665a749e061f. 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/US3DF2233036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb812abd4aa2a4d4d6e6e68945b3e991c139a4bdf4710c6fdfeeed0410f3f3978. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/US3DF2256307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2170d8ea5d6106284d90a26b361f225393c2ec090c067e784d1a0a0e62ae1b1. 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/DGA0M2414846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc77946c1d5b303b491e2ab0425c992cd824839d335ab7bbf4b0d7c9c44074ee. 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/DGA0S2421027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc409751b44f1aaad9b4b96760557e702d2f036bbe858b37453d4f500184f16. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FRX452527187.