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 0xc9b923e12774c3711578fe6873f26103880de4a3324c21e341a9f0d1acfdbe92. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f52b5c9-9b28-46f6-bc93-7230f1ba13a3.json and https://artists.proofprofile.net/proofs/artist/4f52b5c9-9b28-46f6-bc93-7230f1ba13a3.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 0x7503ab3b3513ce9a281d6a084fb85bf55a742f100b182a64b42999ce9a90a98f. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QZNJX2403509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633a26366d1fc5349157c17048a3798a811d092f0ddb262d5a08adab314cc529. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZNJX2494045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55307d886e49dee6645d0d11cecaa308fe0281540c14ce07a1d03e4bb37d98d7. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZNJZ2460314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0fc1ac4573c0a4d3652b06c6c007950036beb9a96413c25f477fe117bd5e2f. 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/QZTPX2472713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144bea2120acd02d80069e1b6a28e0c691ba59534f59f995389946d0bb75cfc8. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T15:46:21Z), 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/QZW9K2416967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0294bca8a0bcb78834d105a5c8045ba15dafeb4c90c7da61875f98da6b8103e6. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZW9M2415399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52edf17a473a2f20d05026b0ddc42564b16939d0ea3436fa833c2bcf90cd291. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:33:30Z), 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/QZW9M2415400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0294bca8a0bcb78834d105a5c8045ba15dafeb4c90c7da61875f98da6b8103e6. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:59:21Z), 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/QZW9M2415399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d54c4e23d51176bcd5a514d34adcc5c645b85beb303d520afb01ed14abf066. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZGLM2531747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18ebde8ec7d6eb8b162ea2284db5afc6790133486c65b39167213715770c5a0. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T03:07:34Z), 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/QZMZ92577928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4cbff01137e2fbdd6a10431a4b2842f4f2a4a3f797cb6c40c575a779321b4b3. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:53:48Z), 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/QZNJV2551729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815469c85a4abbf1642bcf61d108a48d5739ba2651567c904b875a3d594bb93d. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZNJV2589922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb3494179130a7840dcaaade649e9d1c956f74a330d9f2ca00e345f29d94c9c. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNJX2505943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7840066a5cc7665ee79c8d00dffb3c994cf7bacd870c7c8e18b92200024ca56. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZNJX2565696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa205435a3a02416e477428376a0046cd45a674832dc301ef6909c8e442573666. 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/PYC842508717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e4274aff1b46e878216f4eab0d7c9e7c949b04ad72728e6e2a97dfc0de00ff. 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/PYC842509261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7e35f5b7a89bb4d1609ec17291fdba00280225398fb3361171d1ef6a8b7d6c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:10:57Z), 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/PYC842509646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929d19ee9a0a5339ef319f5d955de3b03c7f8af3717d7bf4059c7fa65905ce04. 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/QZNJW2430355.