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 0x3b7f783255f43057e23fd14c458c357b38aa8373558489035ddb71f751bff181. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f007670b-af2c-456a-bf60-e30b270d13ea.json and https://artists.proofprofile.net/proofs/artist/f007670b-af2c-456a-bf60-e30b270d13ea.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 0x9c83b43893051c92c6110526056a38dc8e2a7ffcb83042291ad6298ef25bc8f1. 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/ES5070100155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e0fea254d5a57c87d50cf1ba799b35365c528ffc5bc02d1dbdb9827e9f52cc. 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/ES5070100156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172d24008a45ab2fd4f993018e6788081d12f50055b3ab9892284deacd830461. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES5070100157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061d2d0463d6eb78c3bb2f88aadcaa02da513cae6394c21e011127a58e87020d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES5070100158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a822e950b4de4006612f0765d784e85ccc71bd337386b30051a26add628ed76. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES5070100159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbab97cbef62aa1d313f5dae87bbbafc669de261a72e322e642a0cc646fd8c2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES5070100160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf69a20d3076cd073fc4ef27a299e7b2c5bec3b39b2346b5d25e462e9c209e3e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ES5070100161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbd4b977e52935d31a2ad5f48862ff5b69ad76d22b4d55f1523e2949b5c448f. 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/ES5070100162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30eb8826151f524312c67f5cf7bba4113289f48015d8a55f86b1d0a8e12e06ba. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/ES5070100163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f2ed65d0d7f18e7893cdaa78d490eb6920c1babc9859456cc69091d17389ee. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES5070100165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb67d1a712a26fca593eb72712c688ce04064d1d7231d65aecd7cd5097fdf17. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES5070100166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cb5fa1a33f2507324851def45339bff6623e65a9657d33ebb569a28b201199. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ES5070100167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe259a3ad16889d2d9653ef4e4a4ad4eff0f6604d5d1aefa4a1ef4523daaa0037. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES5070100168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b89cb349068e7bb10d9c4678ab009a1da0c70ff4952cf2326d4d1ca2fb7278. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ES5070100169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39291d4ad757f2e424a2a0891dc68fee7ff7d1aeed59f828438f6438b88fda99. 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/ES5070000090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd9545d293699f554e3705f7e83606222f9207ceb813ca7d4ca60fab5f5fbd8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES5070000091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75fb067b0fd8e32fde5db9bc4cec19034990d0da79e082863cb11217ed86afe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ES5070000092.