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 0x604b4185db3bb3f7fa33873e836bcca839a9857235f4f6fab31529f2a113ff5d. 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/e8e97cd2-7d08-4b0a-9348-fdb5ae4e4390.json and https://artists.proofprofile.net/proofs/artist/e8e97cd2-7d08-4b0a-9348-fdb5ae4e4390.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 0xe53f3d99e231b53ef0dcb412b2cc7ca6e798a89b01f7715960df4c0b32795d31. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US7VG1948679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbad0387700573b2141ffd761094f3a0ec6d687c85032bcaa45147132c6f3319. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/BR7WH2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6788db9d1bc03c2db87d5e3de65292cd30f59bd442b80a4787b0941dc3ffcf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BR7WH2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5950db51ef16e09c04ab59ef45eccd7121430f9f01d2af6ee7a0559ae687e364. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BKPPF2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5b70048f51042031e155f7f34c3fc5e83f4892ed04cbe3e3153c55ea341acd. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/BKPPF2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018f4cb432a4a456817f1849e1a3c994a3b941806cfa1dad312c5740aa70ad3e. 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/BR7WH2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb35f105f0e07bbf1add05f026351e6b47d2366f8ddc59945f35571cbf149382. 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/BRWMB2300250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abc328379132a8ee9dc7f3a7d8f3815d02da90932a35623dee7a7036a000979. 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/BCSID2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0346f2ac32263d5a3c8cad6b2388b8ee0648cc81827306673217bbb5f7a7d55b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BRCQE1800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56cd30dc4a06ac88d6b32e50c1181de48231ce7da2d109ed8ce33483a399b54. 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/BXW6U2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52caa19156bba8f392fc6ba0af33fdc2a9c517d85546a516c403360cf7a828e3. 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/BKPFB2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588122cf0dd691be97a05458c4db7b4b69afd45f684f669137a1d224e021b1ac. 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/BXLKC1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880f8590b6f1f55fe6dc8049e016b775e4b3106c729a0701044f1620dca2184b. 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/BXPFY2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c20dc9034743af84a90d203f0295681d67920fc14db6995f0bd16f2f2cd95af. 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/BRRGE1901226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae14423bee60264a5d5c45f4758bfb23fcdedf1aafd842d6a3ab128c0446ab55. 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/BCIOS2400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e6f3840b725fad7d00d1e718b165ac290101feddb3e23f529a87e0fb23df20. 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/BCMVV2200127.