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 0x3193841903cdd8e71c2c614498d1eba9cf2b79add04b110b0ea3a6acd6714b99. 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/b6a968f6-28f8-4201-a962-8abe1b742cfc.json and https://artists.proofprofile.net/proofs/artist/b6a968f6-28f8-4201-a962-8abe1b742cfc.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 0x3152d2f374db80f4b4c8d195606fe5732bae7a4ef1734fca68ca365024b6a613. 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/QZK6P2076373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc987d1ee3e0401fbfd397061b55a74860284a3bff9636aa70f7f3e5a1a933107. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZK6P2076375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a178cbe7792e6971a4b7b66a7d8ef4dff3a201b4dd2f60168819820bf0399e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZK6P2076376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d913114827a49607f71e8839e9f904699c3d71acb2c3825ea278ec1846cd17e. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZK6P2076377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0dd80f88f4ad5fb0398f308a8aeaca81af422474d8a3024709230d643b0bb69. 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/QZK6F2074613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4a2b85d92d6712d4a2664227a378ee96e779a623248a75fdd6be88a8f1de7d. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZK6F2074614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15c0487cac2fad3c89f7d7d3dd244007017aff0144610cae715c15e4b640afa. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6F2074615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc44ebbda4a33720dc464e2b64e84b648a0c63f5044394917007fdf1f008e89. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZK6F2074616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb125093761a738f4e21b775b6b345b51abd21eddb252479f8379b81b8148c254. 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/QZFYY2148608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814bffeece296ff716264791fef2c57ea078436c74eaf015da2ccd537e8fe17c. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZES82110639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b775fc3ae5b467ca07a54428471a4057927d18a683be33ce96e628b925bc6ab. 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/QZES82110640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200677247fb5a46dd7147fd4fe64c4eba03bc2493c8fbd7f46f3843bdf8b3fdc. 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/QZES82110641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b4ab1837fbee786f376fbc305354a5b3bc7bb51ba1293d3341b8fe92771c63. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZES82110642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c1d690bcd9b289ad83b9300929737455158bdc988710e0af3f5aa45c49bd43. 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/QZES82110643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c2c13f8306e6530990dba069522f9749591f5ade6531211bdd9f46efd401ac. 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/QZTAT2176328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4276bc75c512af5f3329eb6a5b7b0ba59886fdd6348edc491edb2d3f24cb17b3. 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/QZFP52266790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40ba49ab4148a304da6a4617cd99d9c92f38b584401f90d218e0d65900fa39c. 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/QZDA62388390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eac61ba7e3b62eb0775646b63a60c31e22dbcec0609400a8e9289c3d587977b. 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/QZMEN2385260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193de574f70bc8e97e5eb1ac97fdb809850735c7383922c62868ae92a5e4c484. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWU2050038.