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 0x0150fc15d2fc87fd3da89f1d33d31936423fe2d8ef1e66afe1d2cbf0ec320577. 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/064392fb-8f81-43d5-afe9-84fc33ca42a5.json and https://artists.proofprofile.net/proofs/artist/064392fb-8f81-43d5-afe9-84fc33ca42a5.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 0x70452a3af6da4206fd927739578f2c0d047fd776f85d18fbc7af20ff9fc31abf. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/GBKQU2445278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7977d7e0740b746fd793d7ebc9dd28b92dc98d858cc4b9529501e58dd2a002f. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GBKQU2445279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5716fd8324bf1de69db1728c7eabac4834e9a0c572d7bf470e6790517f21deb0. 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/GBKQU2445280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ac21e84674409719879304dda8eb72fc48bcfd0aa4ac9020251d44f09e5c9f. 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/GBKQU2445281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7730f3b9e2ecf9263fe304f57c02df05e0978651648babf4f6506d22f409d29. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBKQU2445282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34f7ec283706b85d7263a5a66deb4ec4b2523705d875ae2bcef1348ba9a5675. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/GBKQU2445283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3d3182e1755791ee5ece9b1962e7f0f03cceabbf164b06c23216fc066a68f9. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/GBKQU2445285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2364c7dadff61043ad65b2530d81a01d31783fabb3e2022800f1fad31b7364de. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBKQU2445287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83bafdb810a8f6c4abdd95c3f3d1e8cb6d0bcc81291d32777fad17e661f1feb. 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/GBKQU2445288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9073ea4c55fa64562d07dcd2b9ddb64a1b4b9b922a344b2b3638027a1ee22f. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/GBKQU2455514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b76e40482c2283f58ba0fb4574ea7fc9d1150a63846f4d95ffb63ea41c7df94. 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/GBKQU2455515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d0379dcfab64ce5dcc8efd33b42216dfcde769d7d51775834f359ce31ae02c. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/GBKQU2455517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f5bb67c0b45d4c43c62266dbbbfc5aee55166bf62b0908cf88d1b0a7b7d396. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/GBKQU2455519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ef45900e5e24e9f9fb64aa254775f65adcee467ecc81898a34b106fbb8a6ad. 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/GBKQU2455521.
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