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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 0x5b4ddc74add6b8f602fa00adb99446f6581fdaac15dfce915b91131279ba2557. 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/8d703fef-c450-4de5-adec-c5b2c01b4704.json and https://artists.proofprofile.net/proofs/artist/8d703fef-c450-4de5-adec-c5b2c01b4704.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 0x23cdefa2e1e93e5fd3a11397921358525c71c6b8d7574d6ca5022467de887f29. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/USKO12000141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe343416c581713e20993cb051dda0b40814cfd79a0b4d9981951db657714a07e. 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/USKO12000147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cdefa2e1e93e5fd3a11397921358525c71c6b8d7574d6ca5022467de887f29. 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/USKO12000141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5d98c28246072b28eb5058966a9ee1eb1a7ba08c3956e700461b93689894e3. 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/USKO12000180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcdbc5aef65dff87983f59f346902f82f4da69c20e008d1cb2249843df7a570. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USKO12000177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0def52452e2476a4cbda5d1720ba2d3e4afe3d52d37610933917b2835f922fb1. 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/USKO12000224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0def52452e2476a4cbda5d1720ba2d3e4afe3d52d37610933917b2835f922fb1. 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/USKO12000224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbfe8b379f2fc046f928e339aea885a24c717df3efbfcce0170fe142a4c5039b. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/USKO12000240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2daa14ea2336e6b4260b4b394aae308cfa15b5e659a009ac748c87600460f50d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USKO12000243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97020c8b794e7b2d9a9928484e4f16731c8ca28d64fce2f37cb6c8a8a7b5ef71. 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/USKO12000320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97020c8b794e7b2d9a9928484e4f16731c8ca28d64fce2f37cb6c8a8a7b5ef71. 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/USKO12000320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec25e27e66ae204715186e6a0b51e00188c71079341cc7725195c72364d4a61b. 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/USKO12100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563e3403cbc1be5146b06e80897cb71ecf276650bb56598cdd9a32711fc36f99. 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/USKO12100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de290ef0763dc05c1d9c7cdf393a6426753cb0dbaa78ec5b4754eb7923943ed. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USKO12100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbb3856b5687b68e1250b40bfa1ec30c6c0a72f50e4ef30819114db283d0e2f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USKO12100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af796d7c855443968ad0ad2bdda1195754d80b6c613dbd18a7912e5b82dc7bb. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/USKO12100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4294091c2d5fd205d524f99e571619713cbcd86e22bec3ec10020badfe95a5f9. 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/USKO12100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec25e27e66ae204715186e6a0b51e00188c71079341cc7725195c72364d4a61b. 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/USKO12100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de290ef0763dc05c1d9c7cdf393a6426753cb0dbaa78ec5b4754eb7923943ed. 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/USKO12100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbb3856b5687b68e1250b40bfa1ec30c6c0a72f50e4ef30819114db283d0e2f. 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/USKO12100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af796d7c855443968ad0ad2bdda1195754d80b6c613dbd18a7912e5b82dc7bb. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USKO12100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4294091c2d5fd205d524f99e571619713cbcd86e22bec3ec10020badfe95a5f9. 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/USKO12100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9356c4941bd36a79dd3679e99b24882cb8520a9f478a5c72dcfb9a032153ff4c. 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/USKO12100013.