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 0xbc4983444416e84d2ed47feeb858c13923d986079035cb5c52f52e6cfddf888f. 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/0f90f449-a36b-4b8a-8a79-3314c7904dd4.json and https://artists.proofprofile.net/proofs/artist/0f90f449-a36b-4b8a-8a79-3314c7904dd4.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 0xe7fcb44b03746961425dd20ae02f498cbdf7b09b89516f13525c9db32236c317. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMPKX1756249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d11ff39fb28bd00c48139e1e5eb85122cb1f1ac1bb1a84251d21d85b1aa4a2b. 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/QMPKX1756250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5869d1004a4b04dd478696ae0eb2b784819b81bd6ab8224e77a126b1c4056a. 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/QMPKX1756251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5f2251405b02b36852e75540c7daf139bf83134a3d9d660e33fa53cd818e84. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QMPKX1756252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8abe5746ec3de362963e58862441307849e373b5f2a04e5a4028bb67a79a0c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMPKX1756256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7579ae960277b4f2e27457d52176951e51a0cdfa528c8cb16580a7886d0f9941. 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/QMPKX1756258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37487af69ca312542849ed5e41c2238af7819b129f5b4cb9949f4d0d3d2ef18. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QMPKX1756259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd47d1ffb483afa9a2f99807dbd2f4e21407271e6e7ac5f34d630a9f60f46ea. 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/QMPKX1756260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8941e46bfeab6447e9e10a9d84687e300b2d4c3350e7b52af5d6f9bccd6cb356. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZHN42168264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c4c6c57c38d0d71266257b3d2fc14569a9706ea750ef7bab63f6446247905c. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZHN42168265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc81a6fd0c1beb4591c811d8dcd42906f5321579b0b64b11706135f9529623e. 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/QZHN42168266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75cd752ac94eb59dea4b398c2739b01df4d47f3c77d9bb33d765272fe770d4f. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZMEQ2106675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3df351eb68ea590a204bed9b73ac598c6a3607a02cb0a30ea7d8993967bd710. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN32205917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89deb172f659a24497a8fffa44b1efbafbbed3b0f2f22d002a37c01912625e36. 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/QZHNB2264356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd8e40b72fd28bcc2829899e8d402e69cc60c0474e739a8b548925503075314. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZK6H2309031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68eeafc0a2b6fcd61be279b5b617c82495314ffc226bfddb11d0144b7dc13597. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAY2379465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7892059d4e8bd1f5bdedb389451bf5760a9e8048146a432115e9a749ccb7cd20. 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/QZWFF2369825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54bcc55318ea937928136b79d1ae6a608fd21236d2ace95a826e48d429486de. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QM4TW2510986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba097b6080aa1b45b0367f9dc5a9c9b14cbaa5d74296d1d757acd53087d50c14. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QM4TW2510996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0d61bebba8ff26b59b0e11ef60e549e8075d9c019f9ee5927f2da036b46e78. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QM4TW2511007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd8e40b72fd28bcc2829899e8d402e69cc60c0474e739a8b548925503075314. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/QZK6H2309031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a04dd45a607c5b298f08c06a120fb46a088a13d2fca70d875438c06c374db6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM4TW2511055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68eeafc0a2b6fcd61be279b5b617c82495314ffc226bfddb11d0144b7dc13597. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTAY2379465.