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 0x8ab94e8cf613ad08c2719f65f32836d31e5490069ffd016aca7e6d71362cb0b9. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e680ef2-aa7d-4cc0-8726-42103e3ffd7f.json and https://artists.proofprofile.net/proofs/artist/9e680ef2-aa7d-4cc0-8726-42103e3ffd7f.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 0x16b1ebf2054f28f9b2c858835e758e0898f203da8be95cd3b04c117314198b87. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ782530465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf71cb198d0066e7a58ac2135b1c0b1b1186475451767e568065f36a6f2a554c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ782530466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d805d63a22fcbf9d204c03b176ba0faaf1ab81bd1f882d47328b4b2dc8c6499. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZZ782530467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6864b9276be38d6e2277817aa90cbfbd0fa893134f1f7ad19ea9e34b3177a6de. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZZ782530469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69760e9a6304ed74e845ef3c5c8920e6f8a18615f8c8ea47bcfc72b9870617c. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZZ782530470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ec2d7aaa84014f2db8f8f89e2fd56547aad1d7cf7ed049da68f0702c9518c5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ782530471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a3ce2f6cbe39937db36316442d1f1ae161afb219db7d6cb99b2335b68bd076. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZZ782530472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cf879075c6953fff5e9de2de355996b98218b80f0e3171a7fa7ba73bd0ee15. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ782530473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237d4de6042a47cb9fac640fe2a5cd3f6194e55494ff4462e2975654082c0579. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZZ782530474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40644f6f865dac0a4936970ef4a7c8165eb265555618d489ef43f28e38aefd3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ782530475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14170f0c066c9007bf2f0493206d66f237a9ee2e202f85dd965143940be09b73. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZZ782530476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650cd86529b23f3f4320db3cb9b95ae47db8bdebc090af9e6b1d363bddded0be. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ782530477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb23294e9f1b496f183aa6a67dce970163e939283c18a16850ffbb518fe09239. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ782530478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7814d3f6a5a4e72c871a790e9ca04bd2fe48d5c98e8fe89edeab82b6357521. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ782530479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6800d5c779ba25403d7a6b57c5fc49fe441591d361c7cf6b3a81b99835070d3. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZZ782530480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147f8b18febf125bac28063d3b5db1dd10b719a8e49007b5f5c54c6c1cb2d8e6. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7U2505280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367083170733e4e717346740f5299882830aa47e28bfbe12d27a94ba481b9df6. 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/QZZ7U2505281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3685b0be8809887aaf736e19f58a2f57a365afe9ce83df73104c8494360408ce. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ7U2505282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d8391a7861f8355c1b6383c558ad6ad5a7ac669343bfe0269bc0074f8e34ef. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7U2505283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2328dbe5a03625eeada7031f09e9bc1ffb267394fe7395eb1e918c25341c1e18. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7U2505284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64993ed1c9aead1c899850d094d1fafded1125e89a36384fafbee141ff048461. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7U2505289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974de034a480e44f7cb0cfd1135eee83b76add125c0a9b2c2f33c7bb20e24221. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ7U2505290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f4f511c467249a043193650db4269089f77d98744a113414a31f5c6843a325. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7U2505291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48421cae5abc1596048578f06e9a8b65ab52a9a4f5c20ca0fb903ff2fd2f4fb9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7U2505292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3729ae8ba1b6682a60c8d17f01ca63a149a80cbc320efcded595526bcea48350. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ7U2505293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e1246a5798f454796cba09226f6b77d8082f72548d15ce9dd33b913e27fe9e. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT3F22532781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4f436b20873f85cce9919900cf4b4475049ae322dc71f6b03d597624b53ef9. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT3F22532783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaccb8e47afd94fc818fb1fd1c29bf9edf5dda37e417ba5e45074453b302cddb. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QT3F22532784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217b645a66bf709e939b32c02b5905c80ff90c20e9f738d1ac1f5fc6f928c2d4. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QT3F22532785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3bfa9e5452311769e8f616c54d46bc13ac7fc7963032440c65b44fb888edec. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT3F22532787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1d614d40708e7975be87396af3bdda71d38ec684e21e24b7bbbbd7bf1927a3. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QT3F22532788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64650db214b1e2b99a0c4283a7ef9bbf8d0cd513ba8582f10ead10fab7a1e6b6. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT3F22532789.