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 0x5280bc74248202997013361457a7375f14f3cafd128d3c49128cdfdf125b6a7c. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec170a9f-b6f7-45d3-af9b-4d1682bc005a.json and https://artists.proofprofile.net/proofs/artist/ec170a9f-b6f7-45d3-af9b-4d1682bc005a.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 0xe920b4d91dcb64c1f121ba5869204c491a5d8105a606f3bb8bb75e4fb8d7785e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FRV960400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464473a293e1998135668ef9a787ce18a6e972111f2cec8d06908249e9b97636. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FRP1M1400180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08a06b0c6e5808b352dfd0e35983850328cac15f38d07e6d135c0fe0d5b90d5. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FR50X2175401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73b7fc553e0b49f9543db0dfccf1c4c8c61920b60b8b111840e1eb0a472b59f. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FR50X2175402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1566ce56f2ae85ab078946b8189ec1414eadeae70111503eac8027c5916c1806. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR50X2175403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3476f056b1e71ea54ff0172c3aa222f5e547f73cc15d698e67b1109e098719aa. 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/FR50X2175404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944a4b1b1ad4c6af5e62776f760ac4a919ce2040407fbfb6ccd808e04a236b72. 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/FR50X2175405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7740d1d74cf087ddfaec0c937f4f79f814522618e270a5bbd40313ce33aee9. 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/FR50X2175406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ad196d503989e655290a9284aa6bc3558bf4c17f60edf06bc5a1a647c8aed3. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FR50X2175407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ed7fcfec26f23709c13b71c02c32f79c95f894dd7b9caa531bee2af6b37928. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR50X2175409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6720236217afb00d803448502e7f4bee7867546dbc13616b75c6b3371142ff5. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FRV630000076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534827a06539117f78bed94a9505621d531fc6d8b9dd8175bd391aa9ae875848. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRF252200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27b120d3bb9086c7c2470088e1cf09330049055bb21c498652316a8ef331b30. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FRF252200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9309ebc66693774c0deae370e7611c3fec33f939cdcf18adef1b23b0251d6383. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRF252200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f997b6f99098a192694eff09e549a0c3b09454ace9ef4109fde219ab100a638. 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/FRF252200006.