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 0x842d67001b7c706dbb9ae3a555eda1180e870df00988b34b64abbe60328716ea. 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/8f5ef6ac-b6bd-4a41-a011-5354a336bcbb.json and https://artists.proofprofile.net/proofs/artist/8f5ef6ac-b6bd-4a41-a011-5354a336bcbb.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 0xdb667f5901f699f97681f76a60fd7f83dd7378f8669d2148b8eab82508771da8. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QMCE32100324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe60c1097ce5228e03617ca7ca556d6fbd06e4a2b486b7e2f4c6982b690840c7. 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/QMCE32100466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a3717d428b19a0d5f9c5766a1759d96babcfe4b5f558abe553c5fbf37361f9. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QMCE32100853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a7c90b7d31e7cefcb27a862ee6ba9733ae66b7227aeef517c6c5f0bc7b8492. 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/QZHNA2350956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1064fc45a7a6be7ebeab5c58d87b569041867ff126a4247c035bcd369f12b682. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZKUS2302850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40192da3ae4e51316702abaabe292b448b8cfcbdb3fa0392d8f8edc68fb6f718. 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/QZKUS2303174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bff48f88259cd3d4bc7e3be5b6ea0fd9017e9f656eb8750bf6dfefa3dbb7354. 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/QZKUS2305634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811e2a3924ff8c04e0bc3d0ff033a6094b971c0ce08ac97f2ec972f0901c0e35. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZKUS2305638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90d39be64027d50e4f075d6435c78d884450ecaeb5c74e46cdb77ffe58810df. 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/QZKUS2305632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a87478496017bf6677b2c2c7246bf1dcfb99737fba068828fbd35694822db4. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZKUS2305633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87999ad3f39792567e2eb8c4be99d38e46384035591a045adfb1c10666fd4c5a. 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/QZKUS2305637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc556b78118b580451beb56f885160cf8e31d3d01d2befda08dd8afede380db1d. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZKUS2305629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad93b9a54d73a24b5091467292224d9e4e39fe84604b1e467a8b7c29ab559f89. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZKUS2305635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc383bfef36466b7c215d1b2d8f4a1c2b03e6a4125c3d4835c7b4aa639d16da. 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/QZKUS2400049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82d98087b718d70a3031b5e5fa78e7c9f3247f8ff328f2d39ea7225091594e4. 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/QZES82471762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f254e722a911127f42e296a4141225ba6c151cb5f8551fba695ec9d9955225. 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/QZHN32487585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8c1f1d898e012f5c3bc1ea1c7e081855183d5f1c288789493a739124dd35f3. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZHN52476819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4cde7dc5675b466ea0fecad8aa0b66ceed81dad611e4ba6e8421b5c57b9ea3. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZHN72483315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001c65f71f1bb88bcd4363c5e050d4823258ba498afab51df88266cf6f599ab8. 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/QZMEQ2439926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c546d091afc215b23f983c8f4420ed1b4f8700c9550f01f970b7fc6a57b59bf. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QMCE32100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0d4c8d8529153452996b861cc9e6389065d2b9cff0073e5999e31654422539. 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/US3DF2141734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c546d091afc215b23f983c8f4420ed1b4f8700c9550f01f970b7fc6a57b59bf. 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/QMCE32100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1584e79ad27835c6d06f4fcd12e4ce63c3c90b8d9eecb1e87b2134efbd56f62. 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/TCAHP2335467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32c100beb40617ade6f5275daec5883e80bcd60681368e63d28695f60ce734a. 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/USLD91751850.