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 0xa9892e4b06eca87183eccd6b8447b9b2ea0395826f61d70d5ed31279c65165a3. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/827b41a5-5285-415f-ae17-6b0c0172651e.json and https://artists.proofprofile.net/proofs/artist/827b41a5-5285-415f-ae17-6b0c0172651e.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 0xc0018cf43fdb6411bcffd37fee53755ec55ac9a901f4510bcdf572a2f43d3ccd. 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/QZRP42594653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ba7ea467545265c0fbb41ef72ce50bcdef3e66fa356e8a11ccfa989564565a. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZRP42594654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9875c89fb665fd031a3a0ff855a20a2d49af39bd1fef5551cd87599e79f8e7. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZRP42594655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339e92460d59835f241e25e18bfa57c13965a34a1e2981ae704f8afe4049571a. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZRP42594656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9828ee821058b85837e8523310c5c876f932a1879463aeabb79ee1e118bbd2. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZRP42594657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c0404e9b1ec13f8e871fa97a20cfd86c9805212cd6033cb62664dac8ecc7c82. 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/QZRP42594658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518eef6e77b181676062a9e65c4d9aa472fc3f0095be9e9a016828954a96a461. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZRP42594659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ba97ebe0887f26049c2583268f1297c6de6fe6536ecf7a59db0cbbfe1bb202. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZRP42594660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46778cc2eb1b0a488704599a3da96990b9acb5ab3764a46ef321d6f3ec72eb41. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZRP42594661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87febbdc6be349a71ff5bb4aae205a96df869eb666f1b81e8d7b3d886632cbfe. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZWFQ2511314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5609b5a8bce8abffef0532ed152920a4e49a1a89234308078e9ce42997d165a. 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/QZWFQ2511315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b02df611a8ef375a3c61257ae985156db68bc12172bc4cadb77224fd3491fc. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZWFQ2511316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12084b99c8d356b8af6e7cbe955ff30f434f21a57ef414d264161f4afa590d99. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZWFQ2511317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa178d36253d722e760d2425bbb39637f01bf8d2316c5bb234e614d7958a29b28. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZWFQ2511318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b45cb9b2eb9e413fd823c4d20075bc38e22bf076e52e0b3f3710192f5c1cce. 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/QZWFQ2511319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd689fe025469e32270295f12ddd4f04ffdfeb74a394f58d7a8403d3de93c0946. 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/QZWFQ2511320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46bd85b98be4a60336b30e11e28efc4b30a2fb70d1d7eed98a1141de1886d7e6. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZWFQ2511321.