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 0x42c5b090502ddc058821a4d24088538fe4e25fe079c35ae6302db17fb0240be0. 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/147b53ab-9c7d-4c35-943c-05bc48afde2e.json and https://artists.proofprofile.net/proofs/artist/147b53ab-9c7d-4c35-943c-05bc48afde2e.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 0x21e22b4a53d0b7dbd2defea4575c50de0d8fde0bf06d92c6be043269378dac34. 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/GX8KD2213947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe11baac9932545318129df4a46ab6881e61d50b33a7e204689a60b4077aedf. 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/CAENV2258053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52eb80d903b146153839e326db85e744d21862c7b68fcca4fc36de0438ec5093. 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/CAHQJ2290384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0224b0ed90e2f0d17ef9fd4ab59fe0b55fef0126db4b55a4d46e0a8c38722a7. 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/GX5MY2266822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74d3f513010b7c96f7f8da49e1ee215570f8a0a430d9b35609f9f1ab85cf716. 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/CAHQJ2264671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e354f1c054b4f042ceade79e2300e61e9cd089defee2ab02c70b40627870d6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CAHQJ2241781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23f3b6d8112d41c0fd4fd0922f10f4e57ffa35addad5586478b57b9a7558f9a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CAHQJ2253389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fc18d1025058e3c49910a8292b2062de247973dcff4c7b918f4dc0318ff154. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CAHQJ2246339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500e722a6bbf5af3b1521301bc861adc52a893f4394da62c35313d13f11624a9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USHM81947966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12534595e60d4d70bf6fd22037f27d00a5ac323fe6c5d495abd13bbae0dbc255. 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/USHM81901933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a94e2e3ac8bcef16d64752234016948a1dd720d2f7e83ec0e4c9d8b9acdba8c. 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/USHM21944686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf9d8b3cd0b87596458a0ecace8b5eb521acfa9993119fb770e2e17b1831781. 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/USHM21923628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04db146e6d3c01774bc7c706e608e52ad3e5b70c61ef74827dfae821973797b. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USHM21910722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b180cbbda6d375a8c74ec3afa592a57714496cb523eda60792686339b2e660. 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/USDY41994577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f9b05175c503def607210a764cde419963dba81532bf28c9172c644957d159. 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/USDY41993680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5a9e7423033f8473fa123e2390751683dc06b4e45764373df98ff071db3be9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USDY41984607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba153bc300bf430faedee8097668a1486a723a092c8c9689f89efb4dfd5e4ade. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR9DZ1900929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f305aeb5896768f3d4a0aa141d35f2706639f3c29a528ca4145d092da0e8fee. 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/ESA011923131.