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 0x828315d979bad16f8c14609f368201c7c9a6d86679852e7de7a191667f269855. 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/a0a40312-0002-4477-8236-09f8817998c0.json and https://artists.proofprofile.net/proofs/artist/a0a40312-0002-4477-8236-09f8817998c0.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 0x934c92b61cd0e7dfed080d094d4b5407c0e4ffcf03e92a3dae59ce928afb875a. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FR79W1600120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5165c43ed524cdb46aeba548171cb9d9a273bd3cc685e9b124dd287b227068. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FR79W1600130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b369123360d3d18f4906785070807fefbb61661ba774698804e3c71fd9d49f4. 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/FR79W1600140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931c2482795800d80e9e7adf7a225e2a7d0fb6593393360ba29daa8711b381d0. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/FR79W1600150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b086e4f6214651bed246ebb29575737350d62e0c444c325c7fb4797e6174d7e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR79W1600160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe457cdab82fce5bdffadd6825ded5b636a28ca328dbed5d0b1562fc3b1ddf328. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FR79W1600170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fd94da6cbd0c9e18e243b42c1bd6d70f4b5f9d698c9524092c3db8f609853c. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FR79W1600180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3a6fb67a0ed299c7e186272be0d0fbbd74df3e37f868c7b16b363b2c744d68. 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/FR79W1600200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18d6c6fc15d44095896610a829ed6e93376683460fe3577d3cbde01031ad3ef. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FR79W1600210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9079473b581399a0859217d0602aa502b23e20be8047b5ec99a8962c610c5b2f. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FR26V1526920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa54c3c55e743559b20f9a49bcade5a6197a126fd138ed6dee8b552732d59ae5. 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/FR26V1526921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8c7a10de3496f7989605465f2b95e93fe42322bf6aafef9cb9ca23609ae13b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR26V1526922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa680a9929fc5d7083a9357f6dfa9ba7aedf886972b987b869cf6214c9a5ca632. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/FR26V1526923.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7b7f1070451140668c1d1e0896effd9217aac530c2177e35244f2dae95dddf. 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/FR26V1526924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966caee1698ab0d34683a8c9bce53b235bc6f984cd5ac84ee51beafeb6c1a039. 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/FR9W12318021.