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 0xf932f8b0c19e17115382b013cc69c2779a2519f1478b06ea74b2ca6fa64e6ba6. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23412a1d-93af-4c6a-a2ed-946dd85a09fb.json and https://artists.proofprofile.net/proofs/artist/23412a1d-93af-4c6a-a2ed-946dd85a09fb.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 0x9e92c4de3d559c3b16c2f33e44390d08baad5e6871ac9dcb4222e4a6f50d4bb1. 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/FR59R1635612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd654efb1d72b75c8185c6efa49475ce821678e9b78962f8488405126ea016cca. 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/FR59R1635606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1983c10a922f161d42f75519ff7a77b6d2d1f1c83256588350b25cdf681ed2. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/FR59R1635607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaada92be77413bca16879faa738ff23596c7c83b8f76abb593b5475e1242a1e. 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/FR59R1635608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3390a3e4b7e4c1f82c8d08d801e8697010ee05d2bde0ecfd87e6b980e313b6f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FR59R1635609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fa4bd8c763f184e0ddf883d685d560d4d677069902a2ac862d6775d8a6ff58. 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/FR59R1635610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1d5f67fa825cd95d3d60132497a34c9a806c7a45a7384c60e3e9e188bec898. 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/FR59R1635611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3e25a0eca545666f9da6511c649530aa90c6a57a10a121ef451830ccc6de72. 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/FR59R1635604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4bd7dab486d0b675366c757db445f365bb3aa3540ab092e497451868d4b0425. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/TCAHR2322544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd324f38aa4fc4bd6e4aa72c8139baf2e8af8b5f4c8a66b7a1cb1c703b37dfefc. 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/GBLFP0300129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bf4948efcd72591f1f83e87a70526d9f45b41c489eb9f0cceeb3f43ede1059. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBUDY0900219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6773733acacbea6710175bfaf0e60c3a27e9edcb50154db5393f5441ee8bc55. 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/GBUDY0900225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55266f66dc445ca5ffb1b9fe46155845d3dcc7da4232c6897b3270f8b20c63eb. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBY711100076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7634ed9b28d7ae140348f7cc2d520326f1d5dbe4017066670d86405e362923a6. 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/GBXFY0800160.