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 0xeee138a8c9cf55243b618f3f05cd6ad171c2f0572b851f411615e6184a0d2ac1. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44f53b1d-e6b2-4f1d-9a95-7aa06a600656.json and https://artists.proofprofile.net/proofs/artist/44f53b1d-e6b2-4f1d-9a95-7aa06a600656.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 0x10a48efa03edb18b29d83865c552042586673bc3f07fed8cd8fae40bb5ea005f. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZMER2450027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c58c195ec76220429ac569b4b5de59e3ab6c24ca6c0478fc5a3cd0cc2da2f06. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZNWQ2499540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e69d63c815a86f1545401fa785f4d5e03e3fb9ad49af21d49d83b9493aa02d1. 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/QZNWS2447193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aaa3972c837c9a7de6acd2a6cd4198c234e60ff160e57c5ec52803e4906832e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZNWW2491604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4378a799bd92babbce5211895212d32fd8fae74d58f373a4c63cc91099d938f. 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/QZNWW2489441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4528ca8b15a0ea783747515b8cc35a6281e07a90674f4810446fa62afcdc9a1. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZNWW2486349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fff0a47182c2a18691c3db2ed07b4756fa2903b976fe2d2a7f40e7fa6d2efcc. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZNWW2491649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c58c195ec76220429ac569b4b5de59e3ab6c24ca6c0478fc5a3cd0cc2da2f06. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZNWQ2499540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af18146bb51d832aa93a6de915cdf8e22be42e39878ada2c2bda96ca1fd54c0. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZNWT2449059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d4ca8e7f1924e082e600f81c404739c7e9c4c592fbe2e9e794a2bf5b9dfce3. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZNWR2474355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4528ca8b15a0ea783747515b8cc35a6281e07a90674f4810446fa62afcdc9a1. 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/QZNWW2486349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fff0a47182c2a18691c3db2ed07b4756fa2903b976fe2d2a7f40e7fa6d2efcc. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZNWW2491649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e69d63c815a86f1545401fa785f4d5e03e3fb9ad49af21d49d83b9493aa02d1. 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/QZNWS2447193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aaa3972c837c9a7de6acd2a6cd4198c234e60ff160e57c5ec52803e4906832e. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZNWW2491604.