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 0x448b163e0e6336c7f9289e4dd26d0b11a02f0fc3263c4d60a6c4d8db3baf94d0. 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/2a1df4a4-8ff3-4aeb-935e-c669a3ad14f7.json and https://artists.proofprofile.net/proofs/artist/2a1df4a4-8ff3-4aeb-935e-c669a3ad14f7.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 0x383dd86ef7955b222a5a1ea4e366e40fb1526afe2d3ebba4a12894ff4813651d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QM4DW1584557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9560a2e104de499028deb08f87c7cb478e19ee19e21beb357da825e7236bc0. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/QM4DW1584559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4d16e004f94fdbdb1b8bddc658c5c1b034b98e8b6ceab31b1fc3b6b69893ec. 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/QM4DW1584561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8045caad0320ecc767656b5fcfc38dc17974179656e4416b2ee8ea0f51af6be4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM4DW1584562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736a270d2e55bab2680e095584d2c42eb7b46775b6d0bf5450f671aaf394f7ec. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QM4DW1584563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d843e361b615547dd5432b50ccbfb85697eb610aa69c862fd41bcf57590347. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM4DW1584564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0450e256cd39e6c0411aceb132e9846f1d4624472d75e90ffb03c75fa252b9. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/UST8K1635998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aafb72fda781eb247df59cd514954896bcf5eaaa4af4f32af12b48f349a8e13. 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/UST8K1635999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70a1c2839174e0ddb341829721974f6c18284add33cc5e738475817067b4a1b. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/UST8K1636003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730383ef0a319944df2571f3ef47b2edf8186d48b25e80d2b184773472cc34a1. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/UST8K1636004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3b9c8151846df9afcddf14307ca45e1778297051ea0553ece109a092b2f252. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZHN42133519.
John Cage Williams Mix 23A (Stereo Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2856138a3ae831984098e63d8fa930393e23793bbf60254760eec7b609e0f0e1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWQ2546261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67f0d87a9c3a4af6cdf70b47aeba4c67dc3aacc64dc2a0f95c17e3a3ef5bdef. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWQ2546276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5246512638094a8db32eaaf2641148f53caa99385fb4cc517c280e14ce7874c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWQ2543787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1b385a705f39e2f0855eda399bd267a617c08901728de793d11927ee8acc43. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWQ2546277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88b3403a6e23862bdd7c02dabe7318fd39407eedf219168e2564e0f7de05318. 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/QZNWQ2546343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c71c571df60156f3603411c844ea243248c39dd3b3531d1a1edc348fb6d295. 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/QZNWQ2546344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2856138a3ae831984098e63d8fa930393e23793bbf60254760eec7b609e0f0e1. 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/QZNWQ2546261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67f0d87a9c3a4af6cdf70b47aeba4c67dc3aacc64dc2a0f95c17e3a3ef5bdef. Chain 2 (Bitcoin): anchored in block 958861 (2026-07-20T10:02:52Z), 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/QZNWQ2546276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67261a44fe1eea3140f4859aebd19bea639e72391fb3672a01c8939d69f649dd. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZNWQ2546345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf714b670e66aab3c5ec70fc120f96d3238831aad29572926842be16f564e5442. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZNWQ2546346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5902c3e3c52a0c18ee0650515d0fa47bd5bab843ad126e108a84b2415cf68a5f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWQ2546347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe205271d0adc3ea7ac742a499432bf669541abc8ef520d778bd6c9e2a4d48c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNWQ2546348.