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 0x66efd7e877c5900d15b2951b3506244ffc695631900207ad39e15a69762618b1. 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/b8d203e3-f8b6-4322-b7d4-05eee2237e2a.json and https://artists.proofprofile.net/proofs/artist/b8d203e3-f8b6-4322-b7d4-05eee2237e2a.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 0x166e7adccab66253d391f0c11a294af59468d934e151585db65fa1cb172d3ae3. 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/TCADU1808425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b59ee0c2281f7d7c79cc83a94d6bc4079e62ea541c816a048044ec1eed52145. 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/TCADU1808430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d0db25b36ff5dddf6206796045839280e28a322120f238daa05cc947f90b20. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZ5FN2048446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544cfd4bea5f83af970bffe75acb321b7ad12a1c094e0d866424ff985243bcfc. 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/GBWUL2036404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a661fa392abd706daf8c0f98d17155101ebcdf7dd7efb4057f03b4726394e7. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZ5FN2048450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd7e49759644dcee35e0641f205abce7bec18b1ecc26ddbdff2d3004abee53e. 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/QZ5FN2048453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3975331a8a1ed3a73aa926260087f4e74d911e0f7c8b0aab1300af88b73acb50. 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/TCACY1736185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c8127bbe90b805bb2278e5396c8367a80e81ed8348a7a13bbae50957575c3b. 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/GBWUL2027295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2a65769cb1620521160ddef14f50d50e0a5fef22903909819b6e89f2338a6d. 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/TCAEH1961629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57136a3029087ed4eb435c3f70fa56bb54885e2f238b22a30a271a4657e7a826. 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/QZ5FN2048491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e53f64a3f8446543c6b1005b78b499d47346bc96771f27ed5171f0ccd809c5. 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/QZ5FN2048497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82f0ce18acfd0b29f458032885b41f912e0117456b42c1984899c316ef50a0b. 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/QZ5FN2048500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f84c87b29218f5194ee875904cb2ceefddc4c5efdd631f37c2ecb689bf6cfd7. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZ5FN2048503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e99e143d590d17f148f68eea73ac538b39b89ca3175e39e8374b19e7824fa5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZEQU2118766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c26051518b651fcefae840400bc1b1a4f307f8884b8955a7fe74d1e3f540d7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZEQU2135821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf266206a9660e85a827473bd12e900820fbc076ef08e1039162564e8685f1d4e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZEQU2267845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aee059aba017c6ba9aab597479e27cf8085832989557eaeab0d7fcf47d896b0. 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/TCAGI2212137.