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 0x9ed6fcd8ddb74ac19155168bbbec34a11e93808764c27142a7fdfa9c7b807246. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16cd0c2c-a9e4-4646-a513-435413bf57d0.json and https://artists.proofprofile.net/proofs/artist/16cd0c2c-a9e4-4646-a513-435413bf57d0.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 0xf252f7df35d42486ac66f30ef4b6c81f5433e41df4132b37153ecd5d420bbd9a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZVEM2360928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7108306d4a20107d8ff2790775635b517acd3e62dfd714d534309137c4dc935. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZVEM2360929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12ff1d41476e535534bd71c62a5a78286364d20f0bc08c70e1c7f80f5edec04. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZPEW2468982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0663164566c71b37ec8fc5db9594d46307c41ab38c767d7f55ecd414e942782. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZPEW2478867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c431f3afc6e3962b8a4dc2af93e2fcedf35643e7d25e13b4e92a98c0fd3af2. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/TLVEM2421694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2538524c30fc52713757352f31325ede539c3175fb1ae8a3120d8a88981d4798. 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/TLVEM2425937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cdb36a1cb7281c288f40714bc4ca45699dd4cfdc8296dfe9b95b8edea0e398. 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/QT2VB2412305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5bdd058f820a3d1a59f64f9b2a263cf332e31685d7ede8a541d9f6a2e91483. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QT2VB2412306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0663164566c71b37ec8fc5db9594d46307c41ab38c767d7f55ecd414e942782. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZPEW2478867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c431f3afc6e3962b8a4dc2af93e2fcedf35643e7d25e13b4e92a98c0fd3af2. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/TLVEM2421694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb404c87746966b90e75df84aaf9fd1839b12314aab53f482ba577a4fe76dbe7. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QT2VB2412309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b475075c2404dfd969a84f689345cd036c770028c5849162dde866f3c248b8. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QT2VB2412311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf042b8bba9429f3d51534ca7f40aa845bd7f2c3d9e11c5c7acf04a151be9133. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TLVEM2405024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f628cbf3431cb5bb2a9272aa52fdc8ea54ba4bc5751863fd82791b89ccae224. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QT2VB2444505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6b6e843ef1058d606cd90576e55180162adc9339306b53be4150a0ca046d8b. 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/QT2VB2477812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92622e578389f0c9028491e78d7bb3647bafd129aafee2e4bdeffb9eaae2fd30. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QT2VB2498528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f628cbf3431cb5bb2a9272aa52fdc8ea54ba4bc5751863fd82791b89ccae224. 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/QT2VB2444505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e3bcd07cf494763e59fc6a83c647864bf3f8e21c3a55c88b03791ae39ad8ac. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QT4K52565572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56aa6902feaa25e9c7358d287f0cc2c3b589c03a5acdd75d3f6c61d7e5b49e49. 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/QT4K42561391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78803868bce00e50a7d1452a9fec7b9cfe6b46e4c8c533997eb69f4ba668bb78. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QT4K42565529.