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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 0xb77bd2646302378820de291e474ca74cc0e9f24692eedf694518d50f72f2d526. 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/e3ab16be-c1a1-49e4-aa90-b5debc87ade9.json and https://artists.proofprofile.net/proofs/artist/e3ab16be-c1a1-49e4-aa90-b5debc87ade9.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 0x4e8441d351bb099b93e96a3b94fc9c85c1097490dfdbbfabca6af32042538c73. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GB8KE2158894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf1bf770a3e570a3747891ba47fd12a75fdeba3a8dac6bb3d27e35458d02671. 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/GB8KE2158895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea3c2c6befc4c5fe55433d2075abe9a4488599c821ef32651514dba15c79267. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T11:19:56Z), 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/GB8KE2158896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8f21363e062440639ece78b0695bc68cf15e55698c2edb93d27d01302970fe. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GB8KE2158897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74908b2ac4483f71a13cf7c3fb52c908869fb8e406a85870469aee1fdea10c45. 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/QZDA42243179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbb68fe5a437bfbb14711b650adbe4bbd208918b28e5cde5245c416ca48b8d6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GB8KE2304229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b95fbcb377e3c9e98ab6cafd9f3c01532efefd95fd7d78ea8877e2f16dc1867. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GB8KE2307865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac1d06ecb92a1cecd6766ce48637a94e1f90a79883e47fd4a632f1e9f8501ff. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/GB8KE2311001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x460df7a9fb5fd7c732ef492a713f8b5fdf09fca8d172b36987a217871868c354. 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/GB8KE2407575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6a88c000c25073a4486729f0125a3a04f663935be442f6076e233e9aaa0284. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZH5E2431754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86746d03bd422ab20ca2f5c711c8afc7d6cbfcf90ab8e4dcfe7eb3ebda37901c. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZH5E2463401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8961aaa459a525473e82d6b4a9b676d821ac39e9a1948bed877d75bcf39008f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GB8KE2427000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2ea2ba013cf8b7473c339a762657756dcef56c6f06974f565abe374dbb4e39. 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/GB8KE2427001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15be3a52ca7baf783cc7a825092746f1b228dd6cb5b6e68d45c80ce64efd60a1. 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/QT3EX2496956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418aa999ee156158926389d8d60dafd8543b3ca9c48c5bfd9a525e9e6ccee465. 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/QT3EX2496959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb4ef3d8d4066030f18bc85060cfc339e99f4a8e1604d3970943ab04f7467ff. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GB8KE1956073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f460101048994ed2f38db621725ea38c3db8684fa22d2df24db66a76744ed3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMHK2298669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bdffd640eb955639710ebe06374cc2a531e9e9900fe2f078c0590d26c6ec69d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GB8KE2053570.