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 0x94a48725efb05432c369ede353d2544bffae3e6451bf88e36e1d3acd68ddcc78. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4b0b0e9-0edf-4324-8e3f-9e2bae905b97.json and https://artists.proofprofile.net/proofs/artist/f4b0b0e9-0edf-4324-8e3f-9e2bae905b97.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 0xf4defa21c8ca7ade8a90437559defc5af25a6208278540174df5711d3a3782b1. 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/QZTRX2101714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15416a211e17205b1b0b496b2ce0fcb406e0e0c22f5cb9d0a60c43bdb26294e4. 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/NLRD51968631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73e9fa3a2cc918ed310de6366e4b2ae754d0a5a57545a4eef537326bad92306. 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/QZNJY2343939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42dcef5244a5a51628123018f07fb766a0084e807123d0d69b51eb3ca141cec1. 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/USCGH1724285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9234f94910efc97a2ec7b312db0b1c3628b2288c4f443e22cb90d1242863cf2f. 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/USCGH1724288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7299966020842ee39ae50eb982473ba77c4e41e7335317555050b8d16322be. 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/GBRKQ2416069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd190f70790288454e11d950c41b1a4d48d1b2cfae4f2f52009bc27d7111e3ae. 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/QZ5FN2493329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6570c6665c9dff9dd2b600d44190608f2d32593813d684ae7c390e9b157e93. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZWV32348109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f95181ba59bdf934f292e7d08f241fe6215118a0c325123907ed5c949da1a3. 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/QZTRX2318236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f471540163e5b2226f0700f31e00698611484ab2973853fbc646214cfdafde3. 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/USLZJ2240807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f3eaaee246eb1a19ec7b149b151e914c01ba86b155790cc9bf7686bb537317. 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/USLZJ2084779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab3f63f103104de37b3338911d4e92331bf510ec0a45c74fe71cd23cb3aa2f2. 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/GBRKQ2103979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f3eaaee246eb1a19ec7b149b151e914c01ba86b155790cc9bf7686bb537317. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USLZJ2084779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42f6398aa6bb52b9c4500ac535dea05fe0ef3fd2ece09bbbec23388bd60b9bb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USLZJ2084803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdecac856d3face08293779b96df02af98c60ca5ad968e63a92976ed83bc8c4b0. 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/USLZJ2085171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf63a7c36bd5e249645d3bc1c23bb35b32fa67e905058334549e784d846a442e. 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/USLZJ2085173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb73bfc8c69503b58aaeb6565dea7f9836c460fc53f51ba89f9715f5af81293. 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/QZDA42025157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfaffb7ad7bdc728c3ef0188bac82201f16ac731aaed891041b58125d9e73010. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZFZ32063813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0952b0136a3bded7e2c8c34b71365709aeff603137d628fa4b2e3d625f4a81f. 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/QZDA42025158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7055f1aa04e3d4ab0ac5e6bf654af2feb59d52db1c31593eacf50f5035067825. 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/QZDA42025159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e238a692d60ff3bd571fe7aa4c48826cf6d70cfa5d650cafcca537572e06358. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZDA42025160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad86ebfbca7c86e198d99448a316a51d891e90ecc17dde952bd63c748242080d. 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/QZHN71971834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3277afa7434f6182bb1468d37f3b263bfc3bd12d1f7ce18c0fce1e9b74682d7d. 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/QZES81944353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689d7baa30d103e02b25233a264a0f2ef0f16b0e10f87b2833ccc93776921165. 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/QZZ782445696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cf250f351f10d267a0e9b23a0163825229dbbe7cb772f2dca8ca8e39488c41. 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/GBWUL2535562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8072089fc43329f1ddedabc915ea1efcadfe3011351ee28b39223b92985dfa3f. 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/QZZEB2430287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b4c67b111acbd7f59e1cc47eef91b3cf0379a3d25cd54ba01a86fe1dac4c2e. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QZWDE2486954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa5df93b99c30aa09b4331d1e7464e665892c1f49edd8cc6fc97977685dcbaf. 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/NGA602100551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615e9d0663c89c2d7da8bef97767d8bd49031a108af53ce1a68bcc7b58ec18b5. 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/SE6QE2390119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442c483af3934c2da9de06b72f3c6e4a49a26e64c11766dc2c36bb732dec9f0f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZFZ41902755.