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 0x501509af400cab94305e4eb10b85c23a1be19948334ef136b15376f42ba52dc0. 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/897c3d4b-9c38-4d27-a0e6-46fefb35a184.json and https://artists.proofprofile.net/proofs/artist/897c3d4b-9c38-4d27-a0e6-46fefb35a184.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 0xc566bc047b826f80700643caa1256595a11e6b0cb71d9487c9d65fb42fae6618. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCADT1820921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0bc10ea38079769a8ef3af714832704c32b6db466fd3412b74d68035b9a94b. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T18:12:20Z), 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/QZAMM1747585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bc9a45c8ac08447befd6e46400068b03d7001e52c07f05270db9f65ef7573c. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:08:41Z), 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/QZAMM1750627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b79400e8a7d345c9ff8c550fd6850efc9a6afdc4e37bac2b8411aa92b16a14. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZAMM1758808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32df6358e6e5caf332446dddfd4f3cde2abccab3a46dd86fc9baa5881251c404. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T18:03:01Z), 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/QZAMM1758812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7588279a39de737a3b017d5b7d7c3bd5a954e8415782cbd5af39c3c3bb0de58a. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZ9452000299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46eb291aed7a7855b672c838bc99d6486f14001d0788998315071a2a7f7d091b. 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/QMDPP2101450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8c3baf084f944540422de538709dbb6716a9c119cbc108ef922cc53d918a0d. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QMDPP2301824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d01ca1cf096aa466fd23f4b2af100e6d12eb21a8b9005cecfa8e3018798de6d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T13:46:22Z), 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/QMDPP2301896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136b00f341ddf656e7b9b7e7cc9051289a84ee1a34e5c6a0c8ce6e942db0bdc2. 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/QMDPP2401931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5abbbc4b59e9c65b36cf251e7f611ff70bc93ed4054732815b9c6cb3e8fef286. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QMDPP2402000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d01ca1cf096aa466fd23f4b2af100e6d12eb21a8b9005cecfa8e3018798de6d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMDPP2301896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf06ebb66b82e6cc94ac336651bec8e1e4fb5f7f67075d680574082f3912f14. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QMDPP2402001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74543d9e86683a73f9f8084517e69f52c0296a4a26b33117e95ada35bd48a40. 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/QMDPP2201583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b63f3194d0ce8ca7dff540c0358b563a195bafecdaa5e3ed5ee4e8c02c0550. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QMDPP2201597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9ebc5da372c6b6620158f44c8ebcd9feb067e535dc293f2045b6c08bfe1120. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDPP2201687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a6ac27b6459cd6ed4b322d319a1d88980c3dfbcbcfdb50d53617ee3d69a625. 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/QMDPP2201478.