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 0x6dd5573cbeab14b13092c9b7511c803510cca5de23aed5f6ea0f9c1548e8996a. 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/f97c021d-0814-48c6-abbb-ca3a3adbe566.json and https://artists.proofprofile.net/proofs/artist/f97c021d-0814-48c6-abbb-ca3a3adbe566.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 0x0099e3dd724d25351faa6546c42a22cadec44f7b035e5c3892e5cb5af5f7ad51. 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/TCADB1750009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39190673cd4a96f6b0dd6c09d242dcd1828172951ac655f45923424d98caa7a7. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TCADB1750356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1041095b29ed8d04cb834fb2f6e1768979b186dbcd5421c7715abd200266f133. 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/TCADB1750372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8948950e30640bf0e3adccf25f6b0b644f792c09d4521a82858e042c9995e523. 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/TCADB1750394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7643ca4c6bf9b20c0cbd825b9e02ef1ae9c95ec711356512f2839ab0ae5cdab2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCADB1750420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e9868dcbca9703c91eeaf5976f685f33fe862aa650533cd3dc16b48535a97a. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/TCADG1768503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe3281801b95d767cf1055c2aa4c1cf166c7650187b4dc068e1493d12c34773. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/TCADG1768527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba8fa18bec09076802f3b71d04df9fb6cb6784cdfc44609189ab40f2fe16e50. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/TCADG1768534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22423b309ec7250e828af9a303f88f907c8b43c65ce7c75937602e887b8b7250. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCADG1768535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5126607b8f35ed9eca63188d68affba62020a06654148755b90ff2ae4592ac. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/TCADG1768536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6d811717139343504ed4587cdbd976eac15c654211d694c9094b43c8a85bed. 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/TCADG1768547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5036f507e24f349f2da543fa78b3701280dfb2c87cf071f98978832b6dbde0df. 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/TCADG1768550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8774af84887b7120dae2a307c40daa1bcafa3ec6de2e96d3ba948073521f5ba. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/TCADG1768552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b8ed6911e68ff8caa3641fa793f3c7cb5d6b0976da7875ce6cafa2705cde6a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCADG1768554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8361f8d49cc0bbbc509cb06afe52cce00f4f7a118649ee971d936a37e1e676db. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/TCADG1768559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa31a1beb04a012d521c9b8a391878d0b95ea77af416d0a27789ab6ca085d687. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZDA42534282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8dbfeb5b871cd92b01d47527e0a725947dcefec44d856cf784fc6955192675. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZDA42534283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e2a3fd38dcdf3af7185cbe7179da1b274f5e050a0258a0d03875acd824ebb8. 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/QZDA42534284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07c83c296bfdf5f6b7242be7b5fd343db4091163d8be09895b5882395a77daa. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZDA42534285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ed9540490f866e88e9b88135559e8f3b695fa0f42021daba36edef683e55ef. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZDA42534286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f903e35c7367b9f2eb96eae939f6ca719d945898608e44fb8eb02ed3b14d361. 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/FRIDO1911316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeffb2d0e215ae0c6ab80412bfc7a8d854348b8ec76f8c3f6e2ee67bc533f2a93. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZDA42287807.