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 0x6f0a568f78e8e621133596628d0650c77ec5790b35d4db88bdf29692bd0d8a23. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f9456fc6-9a6e-4bf4-bff8-bf112a5d524b.json and https://artists.proofprofile.net/proofs/artist/f9456fc6-9a6e-4bf4-bff8-bf112a5d524b.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 0xa8b79d750416dd14576d7bc0f01a4ec22e13827ce5924e7f3cd2eda47f1f01ed. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/RUA1H1713098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1af0c61890c589d8f44d784c93dda84cce60123b60cc85fba0897d369ee866. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/ARR6V2100525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabc8bf197c1e59dbe7a985252e9aca9837c07c4bbf2503b28ecfbc67ad7e8bd. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/ARR6V2200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63eb3124cb27f1280b52ef78dab8eccf4d41326a1debf90e1c73c968378fac1b. 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/ARHXW2302449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63eb3124cb27f1280b52ef78dab8eccf4d41326a1debf90e1c73c968378fac1b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ARHXW2302449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dba881d86adffedac40d1b92dd0b3fb6ec8aa1435b77e1974962ea009eca44. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/AR1ZB2500496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c567c75f17ad35729f01e2f3f4162f059c9cc73fd6ba4117287be42711963ef. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/AR1ZB2500497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3895175e1117cd2da1230422b6c5f679fb593115a03e9f9343986ecbb7550af6. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/AR1ZB2500498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c15a0debbd4e553a98e9c959b9c749fbd448eebab13c86d51d93a700e3a3a7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/AR1ZB2500499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d96edf864a03b32d37179104afbb64909ae3233af42dc131c9a1a788e92fa8d. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ARHXW2301800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3c30e60ef5361970e336bc591fae2dfc355c17de45c5804dc98888d62bea3d. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/AR1ZB2500500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07187cfd47968f225abc3b9889e3c3dc153ab6f7aff684a3d3a802d690d8cef0. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/AR1ZB2500501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15868f34c4765fd0681fbde5f31b14f1ba77b3bbdcadb602cd516836a1e23ac4. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/AR1ZB2500502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f017dbc580a4a0c8f9e18a5109d1301803842dbf47a6425ab74a21bdc904b2. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/ARHXW2204173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449ff5784a679746f7e4d1cac38715e16fa0d65159df74e3ccdb8a4169cabd30. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ARHXW2202754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc80c2fcbe84ec13006da44cdf3c3d633b35fda80ddc3819a99993a696016412. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/GX53U2407468.