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 0x41fd9fbaa6f019ec08a5401cfbb7fa586b3e619eaa9e7e70b76a0c486e110e3e. 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/78e2b0c3-4674-467d-934e-91625f2ebe42.json and https://artists.proofprofile.net/proofs/artist/78e2b0c3-4674-467d-934e-91625f2ebe42.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 0x43ec7bc6feb4135f792d49bd2fe33539deaa6e41f555c9f921f6a3d2c1841070. 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/QZES72196105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ee9c0db5a471e146d49efaa72a5abeee72fdac1245ec2d4490de703f74975d. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZES72194525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60946cfd4ac9728a7be6d8c9764c5da6c3c58ede5b7ac5ec5ebf668580921e2. 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/QZES72197639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bc96ccb40c823899932674bb9be23cde4415342896c7e0e354a5ed5c788fb2. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZES72180464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3945e32baa3f603a87893a95384a9cce36457288a78ac11611f615a3652c7e0a. 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/QZES92125560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596de49449ccf93dd35b98594e72c866020b4800876980db86bbf33c523399b5. 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/QZES92123380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5efad39da7d996bd817ab0439e37e721e4c7391e8da74a52e05bf3ff492649. 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/TCAFQ2173129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa782140ebac6b2e8c2b3385ac868f25ae69c311a5cce3ce51d10d7653343724d. 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/TCAFY2188501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38219efc87371026a52c275b10097ccfcc28c3b20cc79ce0f279b76587ff510b. 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/QZNWS2408293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0111959ac1efe56f4abf92322ecaf3887034a4e9a4bfc0f720d8cc99d91f48d0. 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/QZNWS2408296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466715ec269030517993e4d1988833804d0caa120f3caa5f39e270649a8c9633. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZNWS2408299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3b7d09559193454b844ab6ef23776ed164a53fce98ae0e3164b3bd56cea437. Chain 2 (Bitcoin): anchored in block 958369 (2026-07-17T05:20:29Z), 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/QZNWS2408301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16446d183652ff826064d342000a62da92f23e9c401dd2d8c67a4c38b20c0ab6. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZNWS2408303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5234355485185dabbf7fbe173815664d097391822171ac2ce231922fc216196. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZNWS2408304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf433f388b83f5a6cd343dcc471dc61b131e43d7cde3f56721dfaae5db9491e. 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/QZNWS2408306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3052e4aec090fda1ab7c29fba8eb7e6a9a61aabdec38f3a70b5df2d09c90117. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/GBMA22508481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9273f4cf1795551c5e79bcaf5e27db7d0eb1ad7ff13cd27390bb6854a1d0228b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAEL1903763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a09fd181a449f460e0b66238074317967bb3e948662b8030cbd9b72e649853. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTAU2122971.