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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 0x8ad188ba704b9c5fe60f520b0abb96ebfbbea738827576135d348fd3ddb2ad38. 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/12b4c7d2-2a1a-476a-93a3-bd0d63eda439.json and https://artists.proofprofile.net/proofs/artist/12b4c7d2-2a1a-476a-93a3-bd0d63eda439.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 0xea4d56e02e1c67d9a2fa552e70b56a7d84175e143518d7f9cb6c5e063583d704. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/US3DF2417456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa425381205953dadb15cc06f07f4213f494e305dc71f3cf037686ab60d702816. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/US3DF2495837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371ae2ac27802078108209c36221573b4a84f93c2e5194940ed420cc880b7ddf. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/US3DF2495838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45dc2e17801365d534f738c82a7bc5478c4704f9fbcd039dbc19f29f21811db5. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/US3DF2495843.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbca74347540581b5a9315f52e43cb2f8dd4ef136f7134a1dbd0222b5cb97f5. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/USANG2422486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29925f59f5ce2319539f5031d599ec95a5ecb23457384d55cdef7ee1e484cd1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USANG2436815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ee67c0b09c4eb3983c41ba40b41257e2327fc5be41154dadaa26a1d219c5a3. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/US3DF2495840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2670e8c9738ffa2b7f4240ed4e15fe26534d4ce538fe627eb5179a33bc627d. 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/USANG2436823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4625f1afd3a07c4cc799e24661d034076b922d3da4e1859c44c719bb677713e6. 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/US3DF2506254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af643b90931a3ef3edc83d1e6c73037b76e01d5b63c5337d4253326ff074533. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/US3DF2506255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504f0465d7ac84366b4e0b0b266032a1e40f489f2dba269a40ceb4ac82c85235. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/US3DF2506260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29fbbecae7e58cc2b78f83d2e29d1e3e1a1ab1ac9e714239fefa9686d5138e56. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/US3DF2506261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2052ac8c43d17ff902c4ff7da60c7fc61cf342853dc4612d232e280930991aac. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/US3DF2506262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ae54b4c6850ba9eb1d61a6aadbf3885636a9214b7237ca78743bbb20995931. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/US3DF2506266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f678b8b1dce061029eaede31a4524018109572637508feb6f76b17b2e8c613d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/US3DF2506267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0dbca900e13a5f46f69d583d0b902363d6b0b8a61c9c81707d214021d908c7a. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/US3DF2506268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfddc75b972749d169b0df66f5f1b3cb059fec97c3d8eba24415e68bc762f811b. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/US3DF2506269.