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 0x1f7d144e4387b4c359e617b8984ed73ba49fd17de8d2af609f7af225fda9a6fb. 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/1cfe0e20-0f03-4d62-af24-aaa2325408e3.json and https://artists.proofprofile.net/proofs/artist/1cfe0e20-0f03-4d62-af24-aaa2325408e3.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 0xf96a340d0fc30dcb516eec12f28593707e5370b4137281fdccdc5cf4a489a68a. 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/BEZ351700090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef29096e37aad7f7292d238c1aa117c16b9ecba79cb1a71252a9cf01671ca72f. 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/BEZ351700091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a50e9caa91f1c9d5b4789e50a396edc3dbc8eb88f28f1025beecb7ad998df1c. 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/BEZ351700092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff160ef37f6bb12f1b2a8ab5ae2a48fe19675e06fb174c35d05f7bd10915f14. 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/BEZ351700093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9174a350098f2819014a221e39bfbb2ea54394a6bcc68222e3f49228f2d41c48. 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/BEZ351700094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc153951eeaea115862ad43620583df8b4889d77b5198173d48cd4dab075d0103. 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/BEZ351700095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b7129ec681cadaaf5e788f33bd889c6aab10d5666ef65b21fbae4075b3c44b. 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/BEZ351700096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e184a528486d35c3fb7a33301dba1d5818a293cee225d2bee58a4b0f8e68ad4. 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/BEZ351700097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65780d7bd4432ca8c1524ecf2e5df02da1c9d7a0ca75b1a7cf4226a6792f0f68. 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/BEZ351700098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f22819796976bfe2431dd4e1b817f77bc065925aa6cf27dcc415fdafce6345f. 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/BEZ351700099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40433d6e9cb2b66ddab4a51787b7040dfb640259a677eb6f7ee1fddff508688b. 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/BEZ351700100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954720084488b35a16985acef250fac74e31693e2006b4169129145dc70c2e71. 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/BEZ351800088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad3c2dccf3dfeefc31b02ac095aced483bec78f8f717efeb3eab2e7860ef38d. 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/USYBL2300728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7a8379df3f477300f38a00ec3f1fb86f2927f64ac3427baf231ac432c618ac. 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/USYBL2300732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7175f6545acacbb4db80616d71b68af1c4ddcdcdf97380cf18686170c5aa6e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:03:59Z), 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/USYBL2300644.