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 0x89d6282d7818faa9f0eeb379f9299525cf599d43a77b092b81f7993ba2321070. 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/dd740a22-d669-4767-9144-5d634a7389cf.json and https://artists.proofprofile.net/proofs/artist/dd740a22-d669-4767-9144-5d634a7389cf.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 0x701762e2f467bfcfd26052fcfb6675bfa08b9c057b913346668c62f35b11e5b9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CA5KR2439929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a6fea5ca8b4f76b1aa64a3bb2dc733dccd730ecfbe5b1b162d9985648221d1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CA5KR2450314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc76013c4a8eeea8587588910db1dbff32988797767d92436ef2261198e380c. 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/CA5KR2392328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c109ee31caf5de5010d05b4f3495a7998a9264c829079926121b93745cee585. 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/CA5KR2392327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5a0e215c81f987c2bdb62e483f72dfd145bb4ee130afb20eb39e57a2009ae5. 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/CA5KR2408278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a9efec5dd715b5451f3b0ce2a8beaf378830eeb1bc67a22f34ece2f2a6c44d. 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/CA5KR2433482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0da4d6114022f72bf13357a8f4e610c94e46db2d9c3dcc85fad8f24b93b1356. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/CA5KR2442333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141b1df59adc236a56d786ca4eb467c8430fd49a39da3abad638ea47937a6136. 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/CA5KR2446045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e47158c901d7c441bd5c30daf68fdcb9e496041584b4167977c1830ee4425e1. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/CA5KR2446829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf57426e5e83da30fc6d3088a0faf1cef52bb48ade992b9b9d6eb3a6e1dd20e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CA5KR2450698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae534b66be09f4c67b143bb633a3f6d5c1304959fc458f0e8cd50a1d0cb50cd. 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/CA5KR2457090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411c976c6e8921a618aa32ae8c304396d2edd2e8bfb33e39d62255c05f7df705. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:50:51Z), 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/CA5KR2458225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66307938fcc3f6ffb94b25b8fdc3cc37b9d0ef41cb6565529c2d0fbe751120b0. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/CA5KR2466933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232446f93e32d21ae8d5537da7b4bc61c29de8db5cc8fbd3b173540d71eb6baa. 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/CA5KR2472920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1d89676b1de68afce3483746a901e0718c9a0a1695bd620e7a571fabb7fca0. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTGW2403313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49ee4d2d6c0ea6648e7207a38cbf241bb40c20f2ffa93ac7bde9b8d3f37c20c. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZTGW2403599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c3138b53da05f8ee4408b692d1902aa6c082f355d928c96a1813cebe126158. 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/QZTGW2405445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575f41633254ae6910e71b0537fd6801f873191aa8b4bfcf3da9bc1ef7a1562e. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZTGW2405604.