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 0xd8859bcf3e54ef97358e73aea203d3848e870892bfac07a369ec9cce061daf3f. 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/966af8a8-43fc-41da-b33e-6a5d4428fd62.json and https://artists.proofprofile.net/proofs/artist/966af8a8-43fc-41da-b33e-6a5d4428fd62.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 0xa76bb3f5b01a7709da7b2b588fedd5e3d4eb9fca926ed756ece97c664aa9d04a. 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/IL5841923910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747f3c38f28007770a54b4d2bd6f89a46726e9e8b783fb4edcef8765754f9a19. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/IL5841924305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04bbf64fab2520c256062e415ab5730de93027dfa7e65ffaf7901e07b7d0382. 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/IL5841924442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc73e31e81827bc1252a8e890ad13d4a8463e8dee62ba57bf7875ac5acb338c. 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/IL5841924522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17b55279c5603cbcdd5107ca2512cb7c30cebf76db49a863ac639482a530070. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/IL5841924504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457b3bfb7233411ae57255aae68991002e9a6bc636b34a194eb244110cfa1308. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/IL5841926434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85265633f35bd0b980e895c6c7445751ffc9f2e24d12474659e6195a25aebccc. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/IL5841926433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7adceda450b831bd0006fe51cec313e6218b87d5d379c3be964eff5dfcd195. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/IL5841926432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994001149c39b7909f42d1497acc40836fe1d0c0ae621636779af0ab9eda7997. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/IL5841926430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5648839774b0b4a4b360cc4f2b5fd4426b45db010e4b2d6868324602bc276c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/IL5841926429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63bce9dae1c179e8953da2fc33e6e9e0a98ca35010ee8a01f4cc7c7cbe7dadb. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/IL5841926431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9949b9856fd390975b996a566dabbf5c9226de6e25ea3cb89ad4fbc4928a24c2. 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/IL1012100662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1dd2a391eb0daf749e702606feb546d3c68d1ca2d248f05e8112349023f06e3. 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/IL5842236372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01723851e89c2cee7fabaa5331ddc7c8048acb4a2d2472ad3c4469674ef78e52. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/IL5842237445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f005a25f2818d60a01e9f1fcaa166218d514c8a7c8cbd450e7c3b2c50573639. 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/IL5842341825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe0aac64fc796cb6c8274ff2436f6d89fa5702760b4425c34cfa5d0a06ed3ca. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/IL5842341828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f744586853b8a35749523b85fc97f702238f025907f17a599a1f05a319b00f9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/IL5842341829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cfa0c6b2567cae33f48901af06d19775aa020dd76e5e80414e6ad8e9a77b64. 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/IL5842341833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e8fe8f07ab8428264e2bd9905b18e7ea581aa49e7394c81a710725f6c19b99. 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/IL5842341834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7269028fb73d75667724a31992d06edc0011c5bd32b0e1226cfdcebcba43a7b3. 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/IL5842341835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ed9f60289498625cb342863bb8c6c3ff3113dd6776de8456bfc42ab7607f7b. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/IL5842340587.