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 0xa76f678ea8dc3d691b49716551317b52682083bd308cb00b8c41ae3884807af6. 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/87b32875-fdff-4d36-a959-b783f505a7a6.json and https://artists.proofprofile.net/proofs/artist/87b32875-fdff-4d36-a959-b783f505a7a6.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 0xdb4556d852d4fc88ae14236807f8d643b2ba7809d1b485cdcb4c69b09c125a95. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9DA2100840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7782d569b3fdf69ed5869a964d38a56012f76501fad6c83eb1a4fbb6f6650ea9. 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/FR9DA1900270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595efdfebd3784801f6cbd01ec18072bd8c0838dd58215a3f317ff240ef99eea. 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/FR9DA2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd41bdff6d26a33dbdeb5b568ff921016b4d29879ab841ec506750ac516e915. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR9DA2000180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51038600dd1cdf17718298405fa038cb6cdc488517b8004332fe4ebee70b824. 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/FR9DA2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4556d852d4fc88ae14236807f8d643b2ba7809d1b485cdcb4c69b09c125a95. 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/FR9DA2100840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3148dea2c70cd0b5b968f82c4a93bb6903fd8516deaad888d26a8434bc89f8f7. 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/FR9DA1800040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6529df97476d1faad21c0f02a6ba9579d315fbe94de86f369bb1543afb08d4c9. 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/FR9DA2100570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33781ed48cfc8f429f4ac02fdf84272549f8ceefb0efa6a1f467933a354cd6ee. 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/FR9DA2100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3bafec1d252fefa6e67f498705ba4787abef62961d84ba64a05f6d9cabb474. 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/FR9DA1900060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553538522228f56edb9e42110685cc1f297ab96ffa772a57ba6ff628c7766fb9. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR9DA2200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1265d0f4db94346ae75bc0c4587253ecba8daf58f21c10e24d0a3879abc6be. 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/FR9DA2100760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e43ec02c94a9a25905b336621491782d5622bb48446f6a8a3c9d85598f60bc. 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/FR9DA1900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ac8942f3db30f2158bf1ea2aa57a957b23aaa30e14ce47fdf9556790091e82. 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/FR9DA2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bad9bd4388d20e6953c960a91a506e2d495f4826c054b13e93b2338183928b8. 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/FR9DA1900080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd105746a5c369d3b01c8de363145a56742510ba69c4a6d533fbb3a12d5acd854. 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/FR9DA2200060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489253489af849d7757a307005692374e6b606ad624271e66643b0ea802ed7d4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR9DA1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6543baa49aa3c9c19daf54bf89b9454bb2c3aa5cebc6835f5558c6b2351a90. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR9DA2200040.