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 0x0b75da2b25ab00bbc4d56fc6628b4d5c11be29e873397f2b1b0a9087bb20b7b4. Chain 2 (Bitcoin): anchored in block 953600 (2026-06-14T06:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ecb6c9e-a1f7-451e-9249-21923e7eb675.json and https://artists.proofprofile.net/proofs/artist/0ecb6c9e-a1f7-451e-9249-21923e7eb675.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 0xc07e524020c6a86e72b047b4de8372a920d280df5d2c572ced5b931012416ba4. 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/QZK6N2295481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8da54f3771e4b219af95d3844a3e22e45e06e1b289e636071ccc70378ccc07. 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/QZK6N2295482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158c43da7e88aadf969eec0506671fb2d6c3e7ec6b223c69639497c6f70a52f0. 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/QZK6N2295483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bdbd5f265ecee7262eb9bef13a9c7776aed005dd7b1aefb663566787a825f6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6N2295484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16923419afb11e2c85756e5f2dffd6215052220a826c24a18103312b05c623a6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6N2295485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00cfe97b2c4269fb11ebe441a73e23300b08af8369e86e022a9ad4ad55f2548. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6N2295486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3cec32cff8825a8d110e572e077f0e990fbabea0a73fe081f288fa9f64a345. 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/QZK6N2295487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0000a5a9dafc3ac6cbddc95145991c50a584f36b1c39c7870ee3ed4893feecf4. 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/QZK6N2295488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x079f6eb6f4acfe88a08707094a3394be3c33bfc5d35711d82c1a936e098348f1. 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/QZK6N2295489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733bdcd549383dcd28e0ccb05c9b4fd708a7acebf7f14595d1f9ef13c827c7aa. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZHNC1902846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe03ec784eb34ec7b286aa64314fee0945a3b37fd4d72ddc61ff6f9b5c79822f. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZHNC1902847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1b134cae94f45b8f09314bdd10f09107d5492cba77081350d33c2508eea4d5. 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/QZHNC1902848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31bc75186210b7c4d9291fe759638c15e3d700339b073199660b6b2023aef7d. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZHNC1902849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c618fa40de730f28745d4b7d01317c829a5330a83df10a60dc914a11113e9d. 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/QZHNC1902850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49381386a79d8f3de2d47b023c65f403599f554df878fa7906060704de7de317. 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/QZHNC1902851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd735d3835264f50324c5aea9b3b9b1591420a4791555c909d553f48ac24baeb. 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/QZHNC1902852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe22be5df4bd788419b38e53adc19e19bdf6ff4ebc4b95791a74b47f3acfde49. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZHNC1902853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6035521fb062876374f57de934118361c4160d1899bb01cec9607f500955f7f9. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/QZHNC1902854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe065ea7c8f36046cc630aad2af33c910c71a187ef48d8d9410e30182b4410ec8. 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/QZHNC1902855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e45c6fe105fdd34f01a9febc00ec71c07726afc4e60f95114f3f062787ccfc3. 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/QZK6M2224891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454f4c7cdf7fed94a6db41ea1d9d16ea9c55fac47f83ae3a68bca3e539ae1475. 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/TCAGZ2360791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec5e16bbd3bab064d11ab05bea4658722728b5e92d2ea6b514d973a42db516f. 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/TCAGZ2360800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4845b73817260b8465145a49877c2dd1faf6cfae1fb43ed52d3ed46f56f07fa9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAGZ2360802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c850958aca54073ab5e938bfc513f9e1c2414652da64c19e427feb671c9b430. 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/TCAGZ2360806.