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 0x78005e68820e0f5d9a76597a4e44816cedc1237471226349fcf91c91179d5cc5. 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/ee48be01-6759-480a-a1b5-1fe59537d536.json and https://artists.proofprofile.net/proofs/artist/ee48be01-6759-480a-a1b5-1fe59537d536.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 0x73069a78b3736c8953b6cb634b89734aa7453ad6fecfdd60a1248b0a023e8b11. 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/UK78P1500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8360622e38d8ccd8adbe0c0520d6acbf1edeee2314481a33a474dfb86653d9b1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/GBKPL1828070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e09162422ab8ed58f293c50219b4f7015a2443815066f0bb9b76b72fa2dede. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USAT21802273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d879204c37b20b8e4d758f4571a05a9ffd215c76accc49b983110ef5a19a724. 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/USAT21811120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3fb37f7193f857cf7b51805e98cc301f5925c60d827fc8af0240a684290796f. 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/USAT21811702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf97153779442630b6e4b3bf865b25e31589015773a3440df57e57555fa75e4. 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/TCAEF1942937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4deac9a4f40db8622db4d4d429c5fd86e215d3f73883e978b9dcfc01da5df48c. 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/QZFZ31940020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e09162422ab8ed58f293c50219b4f7015a2443815066f0bb9b76b72fa2dede. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USAT21802273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754e40f6e7dbb520e13a8ff8d79945dc878f2b644f119c5a5958681542112192. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFYZ2084426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72807c77e4f036f8e08beec78e5c1b7135e1f4dd17e8874fa03b080c50429cab. 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/QZFYZ2084427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54bead07ac89eb3a7a3fa25428516d06b181d6bc19b7edc70ae4a919b75fa51. 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/QZFYZ2084428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706442f777a12939e39b560eb6569480e6e453cd7d71f0d50361488b6088078d. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZFZ42124855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fde1815bd6967c19ad4a6053531725d023990bc94d8d6b3a82ec05a1f9800ca. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZDA52118216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1cd7499d39e2f889956045757ba2c0c7b47fec0a4b79c3cc1e006a1250d179. 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/TCAGA2270396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d82c31d9383f147a58797e528088b315fdca8c8cd5663eb9066678a75350cf. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZHNB2212901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9423c30980431ccacbaf669d1915eb018619f68ae72a188e061770bc139bf6b. Chain 2 (Bitcoin): anchored in block 957689 (2026-07-12T10:12:33Z), 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/QZK6L2235134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f0eabc3fee67b546b7376c56d64d13a4fd6c6c3e440e76309458237dce8403. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZTAW2290389.