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 0x133f117c6751bde6ae98658166cceb244333a7274a3a8c305e274363d5e6d94a. 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/6294a63c-5eca-42f7-9719-dd80f03cb82c.json and https://artists.proofprofile.net/proofs/artist/6294a63c-5eca-42f7-9719-dd80f03cb82c.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 0x5e09831e11c252d07d9a356bd553df02354fa18ac416cd0650874a74241854e3. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZES92008287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93eb13af7c127d6a1cbf0d4f8f1747a40fb82c7980d5f21884d263267d45aaa7. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZNWX2070256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a8eff0324a9b8aabf99883d32d7313f6faa4a1073002c861719a2f61213431. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZDA42211092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73343334c2298f589bf1d236a44608c7a1a7a78ad2f16690cd12729160ecc174. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZDA42211095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853adb61670751388a5dd454fa48087722eda55af64c44da35253f670f66932d. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/QZNWT2209456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb891a033e9245dfa1798fed1b52fbbad9fef6128e1a31cd8c07075af23d97e58. 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/QZTB22312923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42c7ebb48faff46dace4d95c57abec92a15c6cc693cdd3f19bd0925e280a72e. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZTB22312924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf65306049989ee34ba45333c09dd67ad73227b004f3b4ac7a6820c189986a1. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZTB22312925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270db8f4d1f1f7d2900ae740749c1b6090a7a31fadf80e9cc20ee0d2c4218c37. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZES72570562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cc9ed7317846b8b43fd85b46bd68e8833e960a83ce4c752432a800d2838969. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZFYZ2574799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b3bb474f29e5f1821521612c28d8c461fcff947bbd93552126734b84a22fb9. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZTB72472202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7955a47bd96332f1c9bd0bccc3e0b9f81746e68eff1fe694dc2c81812b57d32. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZNWQ2433080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9560da2902b4bfd529077174b03a16366c1beb991bb7a0543112885b3b0175d. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZHN52469739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7955a47bd96332f1c9bd0bccc3e0b9f81746e68eff1fe694dc2c81812b57d32. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZNWQ2433080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d83d1e71334d4ebb4439da6909d6cfe56e545b4808f0b724055a095ea842a9. 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/QZK6N2501671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3717f11517043da5fd38218c8ec882d40fe6bb9cd250c66a8d3f1b4e67111de6. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZK6N2501672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cc9ed7317846b8b43fd85b46bd68e8833e960a83ce4c752432a800d2838969. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZFYZ2574799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9560da2902b4bfd529077174b03a16366c1beb991bb7a0543112885b3b0175d. 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/QZHN52469739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e028e40c92e97793be22153be412f6e187dae8c20a8ebf14d7ff1e30eaf890f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6N2501673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1ae24d86c5d5ac0d36611401ce8a5e70a0c1658e8a8abeb3af7d8b68c2bfed. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWT2209455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270db8f4d1f1f7d2900ae740749c1b6090a7a31fadf80e9cc20ee0d2c4218c37. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZES72570562.