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 0xc491a642eecfc7e90e4461eb2dbf3894c5ae793762005579a02ded3ff99b42b0. 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/9fac4c6a-be84-42d8-80d9-720b84fe727a.json and https://artists.proofprofile.net/proofs/artist/9fac4c6a-be84-42d8-80d9-720b84fe727a.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 0x492a64b8216d9068acc182b2d0813e41c23c192d0a365e076561b6b044ae6709. 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/US7VG1705721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12c7c6d99720b5b8ba01294823d6990c0507f9b8ae113cd053cbf6db3b75e49. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/US7VG1711239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51218830bc4ee1782c70b162237cddb6b7c154e7b18f59d3005a2efa96fdcdb9. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/US7VG1711243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d9d879fb969317088849f74de8d3bb0783bfc4676df4ff4e96387fc11adf0b. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), 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/US7VG1711445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eeadbaac1469456cd9054183b8836f94863ea0f3503fd67d4b68665ce50137f. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/US7VG1714653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cac8a742006a69e4a55043b34d67712ba536c4d101feaa85e3c0695c5eb7fc9. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/US7VG1714656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4148e01e6f9a2b7b9c05236920b60c78d05faac38ac34b502ecbdb2dc5b0eeb9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US7VG1942953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4fef46f7bf5a678f718615f7648b729abbf4547dd1d4e99683c3ed6f7406057. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG1855201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ee01ee86d957ff166fd9c093d37b9a4b11bc6dec0491b2dca0dd9c3c8737e3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG1855202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebfd1f74bbc20800a237f0bda54c51178511733e37eaf8a38acdfa37c53fd39b. 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/US7VG1855208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364e0e707f55e7b0f23be35f4270a6d77883800d209d73b5dc96d50a358e1446. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US7VG1855209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d45f5b64701f79e443cbf4632b861fe207a77ddef9184e0ba44293da2224cde. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US7VG1855210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac904882d13ff2e3f4313aaf9f3811221ae883f43e245165af780dfefe0b13db. 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/US7VG1855215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40ed51b8941e2e3156126d40cdcb1c3ff623a2fc0ee01e9d7c13f65f130d2a7. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZMZ92063581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc4c368889977eb235b84d0eaf1500e869981c19788e17f7296a20ebcd00c87. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/US7VG2112465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4445a956b756ff998c2b4de30d96d3f83fa1595625dd0b4168ae080d47d0b03. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ARIXB2101559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3285f6bd8ed85e635f43dee6830561676309e6413a4d197a1273b23892f2b5e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNJW2146408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc725c16f39505cbd4f6871589bd7aca53397b11df9045c63dc7bf3a4813f2616. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZNJV2333034.