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 0x9e4f26c6621307b51fc59cb81e75ec00e2698152c002434bc8019f9968480f0d. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0678f934-cf54-4af6-88ed-8133a1b23058.json and https://artists.proofprofile.net/proofs/artist/0678f934-cf54-4af6-88ed-8133a1b23058.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 0x3dd1b43ba32508a3ff547c12b5f94bbf42537ee947e382206f3fffbd901c924b. 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/TCAHT2454291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f8fc7b5afa95c2799b0ea52c9a857bf8d2b3466ba000e9c2fdb9103f980c450. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAHT2454310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda735947fc1810ac143f84b1bba84a0f035b609db73a06b62cf697f7c95d167d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAHT2454321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644f91a61617988b6041a8d0e39e4d4ccb54d9c27bbbb42562c68fbaf6943b8e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAHT2454330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1beb113a730a23cd5fd52a7be55b6387b09a66c250b1325ff7f810a1faa2bc52. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/TCAHT2454337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35c8f903b229098058b6f9e2dab87814f1eccf83ccaf23bd0398b8ee8b43a8b. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/TCAHT2454344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928866de1c4f40d0c0fb4991f0d7422c34d87b38cda736621b62076f486e70cb. 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/TCAHT2454350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806597c66a729af556d1f9008769e1977686ee88cbc2dec9e61a8c7aa4004c0d. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/TCAHT2454357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0d17063ec6300e68d0dd2ea5bd028e3261c5e2172b7cfec9fd1e9ac00b48aa. 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/TCAHT2454364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e673d3af9f24fc56f716ac37e467f64b7b6be90b546e5c0812a01103241c82d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAHT2454371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fc0ca4c9ab4a0a0a76014d3af748178beefc8844bf94d01f1a8d039942589f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAHT2499290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7726cd5ab59f1fa00ac5bfeb421efd3523e192e504f6d950cbfb8e3d45aa7497. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCAHT2499299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b503042a274d3f92a0222f05d6c009ea8bd7b5aa5ffa64055268f14cbcb7095. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/TCAHT2499303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd584276b92157d0d8a40df8893a6169b7eac5e592a99bc83ce2d490432bdf9db. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAHT2499304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99c9289730fc48c565622146c0913698f9ada9b71de9dbd3674e38fff3a6788. 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/TCAHT2499306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda96a74d32acea243c39fcd9c49939ed8043a1ae29b9a6eb95b68e66932d032b. 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/TCAHT2499310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312ff5509edbd45336cdd7864e9eb1c9ccf38dba42579b46aebc56111a600b7b. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCAHT2499317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdf93c5c4894c2798ab9ff01d5b9eef39a5d0794af92a633dbc9d52ef6fc343. 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/TCAHT2499321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28845330818d35a8be57b2e04f70c07f5db09f63635230153a48913dd54a9be8. 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/TCAHT2499181.