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 0x264c3c02f817aa0a438469697b42f9128673e2d9ed66b0bed976d3791832ad03. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5308fc64-5f98-4fd8-a9b0-62e5e1991ff8.json and https://artists.proofprofile.net/proofs/artist/5308fc64-5f98-4fd8-a9b0-62e5e1991ff8.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 0xcd8b7f5c9a8506d9f200d284152fd03ed5238de29af8abd16b6fa7545a0fb666. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USHM22206282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43e3c1981f117756a8ac8487e9a336e2e4c731be0f98cbab14bed495cfb2018. 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/USDY42229792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389a669878cf67a018609000d09f3e84926de699317f8faf9dccb3c2162c247e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USL4Q2131751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d131758c80293a983488ee50c32f0cf16038509c59a071d7085e1da5e5b99c. 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/USL4Q2131760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e6522d976b3f2accae6ae0c41755a8bc1aaccf1553c339ea3227070532b642. 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/USHM22453845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b528812e0d106f37e5da5c92712807ae2d11c8cf75b0062a8c4495982b7e3d. 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/USCGH2479010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df88e03e26da1f97a650f63477a77ee0e9508fcbb605a224d1f5c6b737f1c4f. 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/USDY42281298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f41a84f57bc4623ccc1383a7763943dc9377ed763c053a47b88fc76d316c937. 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/NLE712000187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc424787ac63e6bafcdf84cf28e7e62caa7b8cb2c97d0bedf1a15f98f34324a33. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NLE712000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689a0fb4d41574f403c0a9fbfb9b99a770f9a89e37de7a897406ca7dcfe3aee3. 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/CH6552100140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5619b2fc660a50c728450c8baa1130fb58a635e338d1a0b795c3fffa3b65fcdb. 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/CH6551900410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c8cfd234ac958443f05332127cd90a1e36ce3ea5a6e83450cccc48b02ea220. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CH6551900318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe8de478a8bfb46cf5718729e127fb739067a3b60b2286f2a32aa8395bcdc0c. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/CH6552200850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x079d327095d6bf0acc933952d3404048f1312e77a4b54579962f56586093dc56. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBKQU2213263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245ab17ddc1eea04a6971ebccd56c0cbad3c11ea551b56b347249e117c368d2b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZWDD2239359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224af68ad131bffad1ff6dcc660118db7107ec6389f294287a10571328f42889. 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/CH6552000500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30580240b1efc71afd3dcfbfd51918c3ee4e47c12f31e95343028294a9ace9e5. 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/DEZC62256988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccffdcfa342243aadd6e565e968d4f4db0267b777144c384242a7ac4bb447b1. 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/QZTB42259896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22039afaffd04421aefc365c0e9c3da19b5d241b0999a06b2d7ae7c92fe93c9f. 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/CH6552000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f71a6cf9e568eb44d286037c2e3278bd2f2f4a86d538d56104b7c7ad4731df. 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/CH6552000520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8578acabe0cffeb081034ef2fe001e44d1cb922053074bbe4c3313ccc44ff9a5. 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/SE6HN2250086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2031071d6bb4701d1cc3eadd85efd5647e53f477829d4666ac82d20b4200fb34. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZNWQ2253252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e04b0b24bdb37ef8ad3fa24e3aab05d585b4a71b948f88089e2a199df1958aa. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/CH6552100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52decdc3ed3807b422807cec48abae321885054a6689762f9c6a4631d2eeadab. 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/CH6551900315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d2d3cd0705338acaaa37f5b7d8d3345edaf1095f4a7506df49c48e1d56dd4c. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/CH6551700950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafaf8740f7b6e6cd32ca0ff223306eda1bcf5fd2131b8936dc0708a0eeee9d0. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/CH6551800592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d131758c80293a983488ee50c32f0cf16038509c59a071d7085e1da5e5b99c. 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/USL4Q2131760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0a5889da5e11f1d493997240e87087dbe83135b6baa4a30cfc94a2f5828a45. 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/CH6551800700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4afc97fa322cd1521c3c31ed84247b6e15e72c78b7b2bf8c8c14043c29e86ca0. 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/GBR4M2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e66fc293de2c8e8de004ceec60bd1fa3add0c816c915c4f343aa9afd401aa2. 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/NLE712000159.