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 0xb2f01b02b933454d589449a65cfaf98e8f54c5dfec74251a10fac618cd1c4a26. 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/8d8b6d4b-9811-4d68-bdf2-9b383aa84495.json and https://artists.proofprofile.net/proofs/artist/8d8b6d4b-9811-4d68-bdf2-9b383aa84495.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 0x3b9fe8b9b17d3eccb4340ffb70fb3a1c5c1be8a6be8ef05bc9a27baffa6e6ae8. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/CA5KR2413781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2811212fea36d3addf8fa22573f454bba4ba62dee1d616baf336a0bb67735d4f. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/CA5KR2426410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8b279752b0dfb8539bbed9bbbbb5717b3e4c6445dae32b0785ca8e79beafdd. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/CA5KR2435451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527f087e641dfb13a977c7673edd9f98a8bed10f92324cdd53c8fab1578c86eb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CA5KR2458039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93c034ad51745e95ef57a3ba4cb1f9e55ded44f23b0e7f201c6eeb6d59f9208. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/CA5KR2461872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b37c47f7237638a99812887b79376015e1ce9705f383fc9fa6976689ba9d40. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/CA5KR2468476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb205e0a142faad37bc7bc41bd3a401ed16b670833f5b94810f2ab3b866aabb5c. 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/CA5KR2480638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6826c6d3bcea3683f5cec420841031e9e4e7b6ace5aa0923ac8e53d0a760651. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/CA5KR2480672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9ed556a3449cacf79b62198b96fdba4f96f593f0cf45810df84672506cf20e. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/CA5KR2480790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcb54bf07431d3055aa2f881db99ddaf62d8e02f2fd448c7a590701ea245a3c. 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/QZG2X2401654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14af085138b03e21e30af1f24f5f73d59ae9a2cbd8f79b1350a5659641746ca0. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/CA5KR2501619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e656a0a4239fa4e09d2accf014af07b59587dba86c61c4236c93320da5e473. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CA5KR2502695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbe7e938a043f74eba14352d8915d9761578ba133561e508a428b53b9fd96f0. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/CA5KR2511794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26ffd1fabaceaf9e988a315c75d108f2ded1b2bea7bc9f68da16dfba7482221. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CA5KR2511792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbb2c764a4d98504e1e601ccfbe21c235df3b79acf9209417a75a42fd207232. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/CA5KR2511793.