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 0x7cbc51f1c9773cfcee1d47025bd02f4b73fe4ef020b67f4ca432d84822f4707c. 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/8a030925-2f34-476e-a526-8a31a95d222e.json and https://artists.proofprofile.net/proofs/artist/8a030925-2f34-476e-a526-8a31a95d222e.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 0x834acce7b35f9a3cd06cf1a05d4942282aca3ce05d4cd459bb8e671285d7b616. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCABE1261138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4751aa2d4e8f554b74812de20d3dfc2976bd3136e7b4a3bc11c32ed0becb0f52. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCABE1261140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279c7cac8ee0dc3032fe3df683c36b5edd3c8c3240d5b7d1d3557ab29f7ae39e. 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/TCABE1261158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef57e2425160499985089c34714314493e22a39b9bbf2f967b3d5e3049dea63d. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TCABE1261162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73bf4d5282c1b7e4daf9ffc301f83ca01e9692dbc31de6155de58e4c4da8e46. 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/TCABE1261168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7cdcd63ccedaba4952a0494cdfb3ee1cc715c91d20abcdcbcc09db1ea7decc. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/DEQM91204185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7461475984fdd171ed90e2ffbfd99db3fa8f3133cc92762aa661196d4a0f2f05. 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/DEQM91204186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7618740f39a75cf47d09771420bd2d114a10f5aaa22b5867ba8d4c612bdead. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/DEQM91204191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae00a9dcf65c7c8102e027addf5d34f16bc95d335ae9c02737ac897a7cbc39b7. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/DEQM91204192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3974795d022613df492a07e0588082059c8dc38c2503effd6d34a920062d0122. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/DEQM91204195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b23e8ee5d1ca560260afdbbf56120bd1fe09774486a5e59aa996bbf7ebf2e2a. 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/DEQM91204197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f90be9e81ab9ac0a9d6a8b2b9581663e8ef88597215d15cf4cb8598430a083c. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/DEQM91204198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c888e137111b27acb5d1d77c828b88870341c7c672117ef00d653e80d46df3. 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/DEQM91204199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb62bd3c63e237d3e78ad8b2733561a51af84880a0aa75d7a5d5e83ff955220c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEQM91204203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cc5fa26ce8611823f66d60d4338065f6dd8bc826fab9a07d58dc588119800a. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/HRA232500082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88578e8fd9e59bb619a7855d17073c162b2211eccc89f76af9fc27fbf386648b. 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/HRA040142327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16baca74c01342fc2a607b66e7a44a8154db58627740c0357ed55e2928f663ca. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/BAA052228626.