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 0x07156b00edef63af706a1ef72274fc0af0145b5aca69136d7aa21a8192e0c3b2. 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/9ec7f2df-d1a6-465e-9c8d-e18f9a48548e.json and https://artists.proofprofile.net/proofs/artist/9ec7f2df-d1a6-465e-9c8d-e18f9a48548e.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 0x809837e7195210590f78ce30e757d71ff1063704001b29ed91e9288ef63f6d06. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZFZ72039650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264a112d51b1cc484720f51570f5c718068b4ca3c11b4019d8acfe84e0e02db8. 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/QZFZ72039651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b58b21035d59c3576d8a17086395fb69814a372ececafc146e62d0d1d65a70. 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/QZMEQ2001262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15723c7ea34c271b83d0d2d2e51cad46f3e785dbfb16a932819904123cf579e5. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZMEQ2001263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe037d7fa4dc95463b56997984a68109fabedfa45986093d7781955aa25e355bb. 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/QZMEQ2001264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c01f37253b72f3aa4b6808f3b00ec546a480d52799ba73227b247294623e1a0. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZMEQ2001265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6994797de68edcb586211753c2fbd20ed9ed05fd8ef5f09a60da64d09f80a0. 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/QZMEQ2001266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeaa71b576cd77f7f00e86edfdb1f82394501b55fe53f1f4470676ab56ff75a3. 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/QZMEQ2001267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315af6c01556475317d05fcc081ccababa8fd873d2f684e33d9a7b1a7547d235. 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/FR9W12146077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce933350d6e1ae2b07fa998db4a6c4a02d4c8d151ab9fdd92284f4a04894a600. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/FR9W12146071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a9ef980ea4ffd86b174c9807537221a69d060bf1b800238e176f5b05e014ae. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/FR9W12221189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd771e9258243d439252e89f3a2b80aa1ee732f9ad01663aeb707e4072ed0b83. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/FR9W12146075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9064206894c2cb33037d67c53d4e0c2de9854e8ec685bf9c118c22aed3e5e104. 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/FR9W12146076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711d1dd3e6038dcd686f3dcbb115c925f536c6c30e4a3aebf56a7395a369680d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR9W12354428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3047cae8991a3198cf6bcfb465a47879762a17c5fd57986e3f4779c6226b77. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/FR9W12333995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ece925d6c23ec9151d527a943d7ca3db210d192275966b19cf1dddd76d14724. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/FR9W12415307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeacc7fa56e9e5c47c1052ff30ee1d5cce03cca2cb954be8341a7d54dbb15814b. 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/FR9W12415309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140227438f0dcec22d0f2095138a74c745324ae454f9c45fbaf4a9daf7f4285e. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZFZ42205168.