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 0x736009e7624cdf9e4fc710e43a789bfc2a2c61fab477bee236937dbd8873cc9b. 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/707ff3f3-a8af-45a9-880e-6d114f7047c8.json and https://artists.proofprofile.net/proofs/artist/707ff3f3-a8af-45a9-880e-6d114f7047c8.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 0xaa56a7b0623de17d0e682b271880cbad9c8dffda5ff758abda57eb3f2f7f6da3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHZ62120267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2c4b4dd4cc13c4181211e5410c84cd930c78b2922fbc36b1ca0205bb978097. 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/QZNJW2143082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d2e0f9b444c65b6c184e4b83513639d1f94d0cc69382eba0ba419cc259c518. 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/QZNJW2143083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b1b385d34b14f019e3d81775c09a6f4472a1bcd0442890f82b73c467e2497b. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZNJW2143084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bb4f69484cc5682606cfb58786d39f953fcdf9084cda1daf84b8ed28f337f3. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZNJW2143086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc136fa72fa8f730abf20f516320277875a6ea8eab718c45a3776e4ee2874b4bf. 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/QZNJW2143090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5bcc997103ae20dd1e513728245857ef48a0fcd87247b08ee4c10a2bd8c9c3. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/BCEOG2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03c0762ea5fc1a3f2fc0270ef02aa6286478f9ab40b61a8845f922bbcbc84b2. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/BX90M2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2dabd585b35d1951d79a38ae0533c4b112f8ff20679f77e5b8d33415a49e6ba. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/QZMZ92591947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0aa70f1f3ecaf8505e18c695d0b10fc96e35f5dce636a22bbc164360b5aa3a. 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/QZNJZ2599653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a9706d00228fe82deb9df68797db3da0d336efff25228a283729fe6d971338. 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/QZGLS2129849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefa8c227d9bbadca67c40037ff28fec5386890e0144fcc0a5c8f9ecc0905322. 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/QZHZ52122756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b1f0c506811c2fa3ad40204e4ae5211299437a3e02671377246df4dc5199f2. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHZ52122757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6579e16bf3f22e01b5f97b34dc85e8eb051bba66204e565210ba3f23241fba7. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZHZ52122758.