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 0x705c5b36ce515a68dd4c04960f9f780e474577522f17f748b860e62e385c671b. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80de27f3-673e-4d49-9271-cb0a85863310.json and https://artists.proofprofile.net/proofs/artist/80de27f3-673e-4d49-9271-cb0a85863310.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 0x049b0ea656deee67864d505a556e58fa0718cdd4dce0abd704cadbdaaf36d0ca. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTAZ2419298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba841190a986f0b8e313a15c12fdd3872c0115b2c20e006899299f0825f166dc. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZTAZ2422428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab097b853bf429b53ad599c42cfde5323de181886487d99770721fd4d26c3157. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTAZ2422429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc633e9497983b1e3b956e69e24cc52262bdf211c974a761919d3d9dc78798da3. 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/QZTAZ2422430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584790972c11bc65b9a2c061cdc0859a7d22a538ce1bdd6cc9cb6e4d1af73396. 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/QZTAZ2422431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01ab2ba2e88904f8559b31c22b7a591df528411134f01ebd9065ca22c853ca5. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZWFW2491325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b3d3da4a861ac1338c5237db3abe0713a98edd33a9bac3ad7717c2eeec4d81. 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/QZWFW2491326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec40526ea5fe75cf47de4fac720554d2440f1847a8b5fbb5f47200bcbfc38a7. 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/QZWFW2491327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84153bfcaae76f67cfa5d794fd8cef2fbdcd9f8b49abf4207bc3ac3e1ee43007. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZWFW2491328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bc7949e6c3acbcb154548621d775e07c488b334aa6b7790d4ebe8bcd1cf973. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QT3F22407796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a485879034608b98ca449e7250a83118a8a9ed668d5f3762c25e6f0ea633a38. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/QT3F22407775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66aac0494b05f013ed24437333fd68ee92ad78fa15a6914f29e24973ff110521. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QT3F22406114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22358f291553784c770cba819569c546bbb289fefb7412636d45063cf2314ab8. 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/QT3F22407774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc31d533f7aed34c51cb33e85f587c63a37571560fa9fa3eafa84df5aed8a89a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QT3F22407789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7468375d6c4e959cb95a321c65ade60accdc854c1dd6ac8142aa015da52ad621. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QT3F22425412.