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 0xcdb692a5103aa138ea935d9dd4929a873c1bce6581387e5a24d250a0ebcfc253. 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/6c3a56b8-0603-4e7f-9ad6-f881a9918e80.json and https://artists.proofprofile.net/proofs/artist/6c3a56b8-0603-4e7f-9ad6-f881a9918e80.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 0xd8cf8456e3ba502e761aa8e6790ddb6d06e30b8c1079d3a1989b4cb2f12ca0fb. 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/QZDA42350462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd29cdcad5a70e95f234cda7d0f14fc6e064a8c46188cfea643f060f91902a93. 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/QZFYY2323684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b686c655ca557ae445b11a321ad532c7247b958547c44423b8c86b19557ba3d. 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/QZRP42204120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3237b80ae853394acac2a42b63e97d92e7ad26e6a981b4cc36df1f79084fd8b. 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/QZTB62269166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe047278bb9078c60980d0db72c2a91f649ae5816c20aa6f8a7b517f0fd4023a. 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/QZMEN2453726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05de0992d1f5e9bb9be7d80e1b04d951b590d45ff9cf2f08044654ade420f3af. 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/QZMEN2452715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ea550c66505e33766a402d39ad83802ea50e039bcdc9fcee2d803f3ce7d5e6. 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/QZK6G2475540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3727bae0b04ee12892973ad41be95c3357647441b5d18b1a06d2724c020775. 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/QZZ662423817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7547bbf5a38e3ad469fbf89982126b6e5c338e30008553ffc64dbe1ff17f836e. 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/QZZ662427720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc5441a744a91f495ff0011960f2ab688661d9dd5834657eea79c460471f2b4. 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/QZWFK2341298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704cdc750826064667ac2140e04d024f21a02bd95d1b666e5383f6d769507d29. 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/QZZ662339620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05b1b6ce374c5d8c4e49835210efaa2923beae6c7f910dc14a8f6d72554a051. 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/QZTB42399170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0f64ccdcf821e9bd2089608b4139098df455c62955b9ba8bf79b69f32e8b14. 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/QZTAW2337141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c7a42306caf8afecddfc7951458def11435f5056b23a1badc7fc43fbd11be9. 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/QZTAW2337142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9313ec175b74cd15652902a3ee675d924c236b6555b75fcf7156cfd00bd10b. 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/QZNWV2381015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a13b4025ec325bd049b002151c7b2e5bb7f1c38f260f3424ee7c8b6470069e3. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:43:40Z), 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/QZK6K2338493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfe4aed0069804d7fad8ca94e577e7c9784cd7c24d88c6cc71ac69acc3ea377. 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/QZS652309160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd697dc19c6252657a42ec74521f343e5b1d1272e343e517e050a80fbd96d5546. 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/QZHN92357807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021232cd4da5f2c80549384c27fc8133464bab55895871109a0f995cdd88afd0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE5752309806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7f1a5bf8a5ecab3e4dd11edcbe89f5eda81d46276337a82c4c3ef902023ff4. 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/QZYFZ2441776.