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 0xc4fc0ab991ac81633ed0801beb763a5efec92bc1c9e69676d63ca6e4ce001d08. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1aa437e3-a3c7-47e4-b83a-f7af4e790e0c.json and https://artists.proofprofile.net/proofs/artist/1aa437e3-a3c7-47e4-b83a-f7af4e790e0c.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 0x20b5eb03d1659de143fcb1b9dd43b67b0eb1ddf24ad2f98edb8b1e48eb0c8827. 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/INU110000342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6b065a58c5214bfdf72daf894c32577ac14098809853f14db228f1fedaf42b. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/INU110000343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f0062c8a91684dccbd7bacd5a91319ecd1f918c64d16e6a5acf2071031e3ef. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/INU110000345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff51d5314e05bd712ac51d6fa6b1851bb944bae7b08dbc6fde2c0eb0109e43cf. 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/INA1C1900452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348f59da2cf0023ba8abe795cf3a24fc387e02c5b8d47a6d1e15a213b8870044. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/INA1C1900456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1cbfeffe4afe2e13f0bd5fd5d566d7ac5b8d26e949099776b2282205896d5ae. 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/IND292104647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6084f406cf27ca9789b3d7b3002cebd15cabc7981810513fe300bf8ebcdcbe3. 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/IND292104648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ecc92a7204bc802d1c57c8a4ead7721b65bb99a0abd5ee5c0c2cfdeb67ccd6. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/IND292104649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16158d527d827611e3110b1a09471ab6e8671a485510971036c3d7b4e4437b6b. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/IND292104650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde5e4150f55bde27e67e1d39e5aa91c04151973efdff66bc19340971b9c822fc. 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/IND292104651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcaab55bc9d9b9facccc8fd49bf91e80bc6e5f32c5510584565fe30944b0c246. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/IND292104652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b8a2cabc7b387ca694cb4980b6f1614ef46401a50bb6e7fad7174c495aa281. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/IND292104653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1143155d4240d93d0d636f2ffbaea5744a15f95b0bd923f4b733f9f2278eb2f2. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/IND292104654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8473d56a29fbdf3ccf674f0ba912dbfa68d5a08abb91e49901f72033ff17d54d. 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/IND291817484.