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 0x663aaa19399af27d506d37fa9eae60fcc5e9903f9c92e2590fbab3a691c8f9d8. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/488f8c53-9a05-4389-9c68-d6be8cc3d632.json and https://artists.proofprofile.net/proofs/artist/488f8c53-9a05-4389-9c68-d6be8cc3d632.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 0xf188e78c4e649cabddf355e5776efa3c2830aea950e92f7c3bfccc21bda42546. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USU6V9990916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f29903eb99e38f225431e14b2504c1ea299512f0ba0254411c8e9db4b5a875d. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USU6V9990918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06b150e3f3f361a7fd14b628c9aad78747c8f49dc0d7e7f3e289a24b7b91618. 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/USU6V9990920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5756b55a612fe00696dd94f94f364de2a6347bfc9ba8d30f0d89995ad49ca1a0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USU6V9990924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b4b0bc212d2f43c35b087d572675e5c806df57251ea3c7a908a643d7a248f3. 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/USU6V9990925.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92949a26be86f7e429953f0246f16a5f021608e953de830774224dbfc2d2eba. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USZZR1207940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af0b2f434e6e710ec27550b98a9ee7022c4cd035093aed04a75f9263b7ad831. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USZZR1207941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc685778c7202cf3278902e5fb38ed75c47144c32fed955778db5a345b8e39f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USZZR1207942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8738ce9a4a53f985462e334438cc0788a134d02fe5837c7b2e60a729b36da659. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USZZR1207944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcfac3f84abdf31cc46ac8bf983a3c5cd65b9518457dafc594c39f10bd5dcdd. 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/USZZR1207946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb51242f7cbd3b32316cb7541a1d493894fc6d45f2c913d5eab6ca4ce5ad6d6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USZZR1207947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf811f108f5d5f1a576a791a13173f503e42251fa3674ff019c9d0eae42a35a43. 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/QMDA62121369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01031351f7eba96b7b4387dc9bacf47e926f5b10c82e4778e535c2d2d8742c62. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QMDA62121370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04de8b422b8a84690988b88f0fa79a9463f05cd0eb58903777e1ba1d76bdd04. 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/QMDA62121371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97714f2a3ac09e8a711ef876613c13f833252244635ca0df6019745d0e9842ec. 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/QMDA62121377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6783380ab5cea3da27dbe6185b51c670d448db183d315c8ddf8cb8b5c0d15b. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QMDA62121379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2524aa03a175cf56d3efb7a561ea1437d5ec346112fcdbeb54abdb023faa6958. 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/QMDA62121382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd586151cf699a8734b91ae84d59051e2a67fc6744d67f851bb62db44f36c9f99. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QMDA62121383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5af1c82c4acbf53ec6f226e486a52ab34ab56a9c9f65f69d1bd4a84ab34837. 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/QMDA62121385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe272befc22f74d0aa3b67eb904a2191f8b13679dda7c570f5bf186cb55e83370. 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/QMDA62121386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ac85bc30412676664196a61bac33dad5e41be3cd6915487fec1fa65be25cdf. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZNJX2358765.