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 0x70b44047e266dc8a7f9b1b4dd023377eac31d78e985f721c1678b945d49f012f. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c4f7f6e-ccfa-49eb-a341-174b68d557e5.json and https://artists.proofprofile.net/proofs/artist/3c4f7f6e-ccfa-49eb-a341-174b68d557e5.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 0xc3e7e2bf1f95d418dd6756f858803da743d07bbe1ce4c8216c2a2ad13cb1dfbc. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZW9L2397627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2f03a3cfc2d5976d50283f2474addd71e2acfecd9b0b7cb856afb2100f82ea. 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/QZW9L2397628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9f801b582e532385b741f12369b7fdc8ab7ecef83d99d828d9149c0ba8c504. 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/QZW9L2397629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb96e86369a24c329b3da647187a27cea8828e6539552a55fb1861bacfc66bd. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZW9L2397630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffa7df91d068394249c338687f9cc90907b5efc679f228d01b4f95c87e1bdb2. 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/QZW9L2397631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d74763bf36d2b845ad2c6631c0cadbbe94822a9847fa53b4ac77dd62a176e5. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZW9L2397632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53169060d9c2ba92e349975f63a85e00289457d8002690738f0ca3afe230adf0. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZW9L2397633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322c393bd093e08013c1267d706eb7630fd2e5bbe4bf30d4dd9fc6b52a754fbc. 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/QZTPX2292627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0343c6f1c011d9c542cd15d237c52e6344e0b91dd493594ba2ba1abebe591950. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QZTPX2292628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9c9d1c1edc90553fa71adc4e1edd18ae79e6fbb46684008fde95d86235ded4. 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/QZTPX2292629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc16c8b8038f2711e20b1fbaeab7dd5862e96046fb35c5cae96a3ae1e73e544. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTPX2292630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71755f064539877924a8fb03f8b2276fca4dbd2c1956985cd89f86d9ce41cc64. 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/QZTPX2292631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e06b9a952e218d8c214c4d75acd50e1ee0a1c7b1971c87d89270f750c3a9f9. 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/AEA2L2229252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7416994610105ad2ba7d97e3c1d296f46665de4e822900b69144af96f55cf470. 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/AEA2L2229254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4c37545bc45b1e930132e26aba3b0f884ecbfba262c26fe4dd5e1e0a955187. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZNJW2169448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc69dec6b6b8f0c6871eb7bf02c5d3236e60185c7911e66959c004f00ddd27c. 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/QZNJW2169449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676d1b199c5e62f893d5afc4bc8c9863d7bb73941fc39a70e79f8408bb280bf3. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZNJW2169450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f4443f7fdf0e2e7d3f00faa9598c06f0e6347c0555cee823c6450af4ec2dea. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/QZNJW2169451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dcc93865e00c41f0c95ced09e6b8406785ecb36798ea14d7b9012c27cdc8463. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZNJW2169452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fab3690e65ad6573468f8f6c2a08a0c9ffdbc6124470ab6ae00453dc40c87b3. 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/RUA1D2351274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e109a321940182a20041b90d14ee1c228862e5dee0a60f8c6197cc3329e0753. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/RUA1D2351264.