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 0x9eafbbb5e434a3216cf67e6579059a0fc29d0e5b3ef7db09c350b11a9d8c3c5d. 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/7aca6fef-fd51-43ff-97bf-e4ef22071375.json and https://artists.proofprofile.net/proofs/artist/7aca6fef-fd51-43ff-97bf-e4ef22071375.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 0x35737ca046c9098ffe57dbb3ca48211ab340f87f476b54c3fe96705147ccebe8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN62580041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc434a48cc1bf3bd3ae6524ffe14333a6ea2de36d12012f9a4ce4e4868d701a75. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZHN62580042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c0f0177f580fcf02892de82cb95fa9a78c594ff3f097b6c2af21d3c438410e6. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHN62580043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1720db35dedde4e25588cb2b98487d1befe909dd9157d02637ed39cb009df6e3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHN62580044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bded24e55c8583bb2db48a04e55da6eedaa49fc6fc9c4a5f7145de0d52fff33. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZHN62580045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389847f51c1740facba6dcb595add39778a01230e15de8dd423d6a3a37309825. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHN62580046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f2aecfe3139ddefaae304dbe1b8af92cd8e06523283a9a5cfc84954cf655b5. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZHN62580047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb56077ab6ba43c985170632094b118090eb8198bd487e2ef8dca689f884c1c. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHN62580048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada09ffcbecae24442fe0d1b4c4beaeea393359df95fa2173878eb4640ebf211. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHN62580049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697f251c569dd16fdb22e640f966d0049b823c868d373c817341453f744424b7. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZHN62580050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4390602052b1f1868f37475811f87eed2919ec499a54701082a3ef1f714e7d04. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZHN82549047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd155dd028261b541c51a18d3dbe635587ad81a46a10cf6591f33f2268c3099f2. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZHN82549048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4390602052b1f1868f37475811f87eed2919ec499a54701082a3ef1f714e7d04. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZHN82549047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd155dd028261b541c51a18d3dbe635587ad81a46a10cf6591f33f2268c3099f2. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZHN82549048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1540313612b12e06e976c89881b3f5941c92ccdea443d7d2d43cc90179b5a269. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/QZK6N2548836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11b99cc48ad18a4eff6878840596d474d382baef7738900d415a4e66c19c1d4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6N2548837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c5d5684b8c7dcdae92a8a041615dfc71e57164f12aca9ed3961948caa9e202. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZK6N2548838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645442d239f54138011befd191f52db657b1899ce5d900811396314bc0b77716. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZK6N2548839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419382f640ed65c6af0bcc84edbeb9bf13b0b491fdd793402262e89d6ea2a6f1. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6N2548840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb1167117bc5398ad8ac21375730c9f313cc3668221451a7c200cc7768b4533. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6N2548841.