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 0xfbc18b2a18293aa59745b831063c7f11640b6f358a2e71094020fb53f401a559. 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/0e5b1958-d2d5-45ee-bc4c-7970110aa34f.json and https://artists.proofprofile.net/proofs/artist/0e5b1958-d2d5-45ee-bc4c-7970110aa34f.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 0x536804a5179c35c28d6fd3ddee017d4adced050fc3d7eb5c40878947331568c7. 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/QZH5E1979715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdfe26511cccd51391ac303df6ec57a9b46e8d20f89b234fb817b68d793d9b3. 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/QM42K1966448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2459b0fb530685d918e087994b8402392a220f5c3d3415b7ce1dccb9f6ac28. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZH5E1979709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea403b8e33a17dd8183fd4c4bdfc8cac7d652991a8567e4f5319a823d955d01. 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/QZMHP2094986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4989ff9cd1b3d81746318c9c6f409023ffdedaf0a1e7d10bb7f65a7a91321f42. 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/QZMHN2078515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f1f2ccab72aa22a520587b603fbb50efdd2da7ad28df4877930e0f0470b009. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM42K1981053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf3b255b69dec04be3c031af1bcd478d17b1839fbf38f6b0b3597443b1064953. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZDA52258398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35991050a101e156a32b0fd3591f1470ced4c512c54052bbc64df85632310711. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZDA52258401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73781d45a342d54047a0144af85f07a81c5c18fb3231f573f545369fc5cea386. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/QZDA52258403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62f3184b9076333dad1092d3ba4032ea277d740df0b90b67aeebd8800a93f38. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZDA52258404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef927a3e4e2f2d37a203ecd87c9943ea406746f90c110a5f71351ada60537f5. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZMER2312164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa848de745aac21270e12ef3a9598b3125e89d4a8204cf4f74dd2d22057806c29. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZMER2312166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29107ea0ace2a4090a67ed88b4cf22c9bec1e0e37510d86c41232da7de3801e. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZMER2312168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53306078220aa1e17b9b5310db944d3fc393c7ef566ee591922753a8d09e34f1. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/QZNWX2590461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4731232eaafa0b03345b61a66866c0ebac464d6d0801248bdc85cde0902db108. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWX2590462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718e671832599f6b397351951b3c914bc8652ef025d2ed33c185119c48d01953. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZNWX2590463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff1bd460ffba8af14c75cec7500e835eb3a50e7437382509b9d5a0bfa19b720. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWX2590465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67db68408d163a3a029945c528ddfdfeaea5639010666a8b83cbc5c8cccb9d93. 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/QZNWX2590467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad3a11a08f93f879be35f9e44e6a395e3448edcee078474c3e0c0f16c5aa6a2. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZNWX2590468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71bfcd81449a6c41e963164e4bc92c737b0708417b47763cec37963dde4636d. 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/QZTB62206146.