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 0x900e61c9f4aa6d9ad3c22176b58c70ee7175d8836f56fd32e6e7a1ef50b53204. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4cddd8cf-b1d3-4f4c-ad93-27beab337110.json and https://artists.proofprofile.net/proofs/artist/4cddd8cf-b1d3-4f4c-ad93-27beab337110.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 0xc220c86aff6713cf033cd5aee6c3292f58bae179aee9f5604067768b11803a64. 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/CNZ632201297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb210a3553edc1f7d893c3072d67c0e95bd1f0e7849f336a731ffefe5d823c71. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/CNZ632201304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95c598bd36d9204164fc7f7efe6ba57549bce7f8a608f487524589c967de991. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CNZ632201302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ad8fbaea36b7bc1b7c738d447e0817afb887b6cef7fc345a5069a6fcdf15b2. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/CNZ632201296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899f313f10c5fc3d699d62136e92b31a6b9637134b946b1380df63c24290337f. 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/CNZ632201290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb264642d2d26d9e62d3ce3f1368def1db22f38f6ef2e92e63db853aadc01f94. 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/HKG731605754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f13d18d4e18588c57205e1d68088af1bab5cbe4a81505f8bd2a5e87c61294f. 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/FRX452361872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a4951786602b2f39eb246f27197c58253564d380c65134a5dcf2e475b472fc. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FRX202301617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6cc03d161ec2f1607a3aa37773a183ce330a06a79deb385e80b3330b0d6a99. 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/CNZ632200533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2cae47411a8147b79e6445a7337b650fa5f05baf1e5ef19688fa1c10e2a8f0. 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/DGA062403928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c299bbe62a64a834d8ced2b773cd47bd7d5ed5358e0708ea53b7c9ca965a29. 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/QZZ972479621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0633bb6a242f23011a318241c49edc2907de8a7aadf354fccbaf05d977ef3a2. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/HKE022258023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c635063cf9dc6b256d4492f2cc8eb09d6a4683e468534282a11912f4fa2b76. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/HKE022258024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f76d3b7a2ee84dd56eb5b9a58d96754c7f2937fa7c54a8ac21228ef1acde06. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HKE022258025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300c2c38a5ddbf99a2bf0a7ead29bc97f5fdc17d9ed2e1b25c74e39ad6c65913. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKE022258026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9bd4562111889594869c6dd2f3a650f3a65c38c5cdc99e8b4cbc7e1926792c. 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/HKE022258027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdced78aeae5c7297be97531d6e5d356004e394c7835d8dfa2baccc4f1e1345c1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKE022258028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ed01486aa79e3cb8c5072583bded974ec9ef96530c036c916ced956252d645. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HKE022234727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f58f1f605400a4b4dd749972e73b284117ac64ad80123d3b304728b688a4be. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/HKE022234728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5bf7e2f5f1eef640b52e6ad4d0cad0806756c331b96e496c292c2fbce63006. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/HKE022234729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6632e83db2ccf6ff2777228ac9da9c9cc97c45af57564423e3fe2cc37f75b1. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/HKE022234730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8cc25a5b3b494175e0e1bd6bb627a0eaeb9cb11d142366c0820438da0254c93. 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/HKE022234731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb5b33974b1db092090f315a570204b3b1982ba1984e36acf0eeb8bf7101c73. 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/HKE022234733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf80e2302e00cfcc7d4c1b257cdca79652e61c53cabdaccd08f818bf490f8cc. 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/HKE022234734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56b7583b30ef7eb5cddf5d32c719e2a5b50676cc87f67f38669faab8bdbd220. 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/CA5KR2188939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd378f0be8680e3b63ca63b00728a2aa98b07892f4308b4646f86f0eb3321f10. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2188944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d0f5d5c06e241215d877431216d23c4d94647acec6c71d43a61a5a709be58d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/CA5KR2188951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8976b7b2b04a98077399c583b94b76742bd2bb8fc899ec27e484da304602b7. 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/CA5KR2188956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7aec6208f354e6879349e6e9d94bf20b95cd8d84fab4c170458424d14a8065d. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/HKE022234630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3859b19e3345e9594e642ddecc2ef41f0e87bca3487a4865b07e33e290d118b3. 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/HKE022234631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca7842e06865af351415e26057bc64a541a9ce4e58dba39cbf7989c2327b08d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QMDA62428771.