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 0xe252f437b1368f0b3bd653548442a5f452efb62b629ff20f83ba8c653242feca. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c88307a6-9e10-4b7b-aab2-f3e39553629b.json and https://artists.proofprofile.net/proofs/artist/c88307a6-9e10-4b7b-aab2-f3e39553629b.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 0x2798451abae10a96afced9f5409d37d27bb8058bfb3bbbf5e4be438d3783666e. 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/USHM21467524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85bdc2fa4225c89dfe171a67ac09b13f010819d7524c4a852a6362caa44458b. 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/USHM21467525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffaaf5446dc1dff64153fdd3bb60a043120a2a01b7902834bf53db6aa4343662. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USHM21467526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7f0b76dc64c5a0a4c67ea7f739a6a98b3d210f4aa644cd66a9565bdd1d0d2b. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USHM21467527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae75269636a4824f0a98590b5cdf56df184a399e9eb543dbd5813ae7c8a3d0b9. 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/USHM21467528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ecc770def351bdfd8a5cb60016d0e0d1991c362a9407823f8b7bab164284b97. 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/USHM21467529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e3fef53e76b03d2820d3b889efa4e0913d66b22b280ff7a670d860da64f60b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USHM21467530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8a271349af460232c5c453436e3c10be5f5f94b62f9575eb29341055c0cb7f. 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/USHM21467531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3cdfdd984589df4b053ceafa09cdd046f045221a963b46162730739e7aea3e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USHM21467532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb56588b861a4f99f455b42d7e40c6b4a49f675934af8c2b3f2bafff2c7e3b0f. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USHM21467533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4482366428f51f3087b2f22c85186a2cd4bc0984006d4b34f5a8c791672884e4. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USHM21467534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd937704eb5472d1623dfb042c42339eacfc18223fc1b6b19f02d15f3b8fa1912. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/USHM21467535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6134451affed3618eaa10d01762b2baa40c56e08131e761228d48545167d1681. 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/USHM21467536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a51d69170c09bdc72271e2582fc9a838c3b930618ef5541e301b1a16695152. 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/USHM21467537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6d05ed8c32f489883fe46aebc06e57ad22f73440eaf44ccb332f3ddf6b8fe7. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USHM22388931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac04ace254125aa8d42fb0085f9a430446219671673400acb2eb2c8182d1f9c0. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USHM22388936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6ea9176132c6ab528db9a3b3b4f917381c5084735fe3b852c8f783b80f72e5. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USHM22388938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47931441f0105104c3a565a01cd5f5476c07a08b110f20870f3b60d4ea5a9fea. 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/USHM22388940.