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 0xb8856fbed56b781aee44e219afad6a13317c479819b27b553168129dd3a5b6a0. 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/28335e2c-e35c-4f28-b929-45a3d0a5592c.json and https://artists.proofprofile.net/proofs/artist/28335e2c-e35c-4f28-b929-45a3d0a5592c.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 0x612815f216b7422a22c8aace74a69b968f3afb8f14cdf8175464ac2d253c9c12. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USX9P1177733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b119f620c4b23b44e5a84f3a5c3cf25fc7ff595220bc9eb3109ab6479cb97e. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/USX9P1177734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aaee175a92c52bed850bf7b9332cd8d9f30b6175d8d5ff4bf6abb22c53c8292. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/USX9P1177735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6665969263c76f0bbde364cc2265928fefe89c5d5b3e068fc3d0729191ff86e3. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USX9P1177737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c33b5d16eae663b43e324f29bdcafe17fdd420a810ebaac5cea38fbc569930. 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/USX9P1177744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ce74a66b50fe7b2f239bd4c3bb7761c857e549f4541f0d51293910c4112495. 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/USX9P1170461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff92d4e9cbc24d86753d6b7f3595a1756add25f2e3924d07b14fc82aa2433612. 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/USX9P1170462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8366702ed147dcf9118c281b86c2ff4485352132d3378b396de0fe6ee3b3010. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USX9P1170463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a5207ba63bad4105505f6fac2722102a2b438d7d462718ab67ccd256fb04c4. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/USX9P1170464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28b8fc8b9471e4ef3284f98f340dc57cb7b1126cd0f9ac5f318e24fd078f354. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/USX9P1170465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec0f94d1bcda389d503d39d5740e6a94ff907d917244a35e234f3fa60c9910f. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USX9P1170466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411dcf9ddd2ff9cb1aa4a8aa7fb67792217ef78a6a9845efd7b6b590c9215387. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USX9P1170467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2583b6ed566efb6c565927604351b6ee9375bf364710dd578aa2cf79dc766bd. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/USX9P1170469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd26c013563478b244de00ff7dd54b49feaa9fb09b2d2e26166734d5b949664. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USX9P1170471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf849e63f0b67721453e7a39f86e76fd4bace9383548aec70b22a1259aa14c855. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CA5I61100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cd5dca69e8b230bb32bc01d51b39b1ac3da316010fb17278006188310a7ddf. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CA5I61100003.