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 0xc0ef00c9438651cd0fbd5b35277b59e3d92d9e26f00deb506dcadbed3bc89bb6. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b506a8e9-aa8c-40b2-9c6e-b3a4d4e2bb99.json and https://artists.proofprofile.net/proofs/artist/b506a8e9-aa8c-40b2-9c6e-b3a4d4e2bb99.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The History of Tango / Enrique Rodriguez - Recordings 1939-1946
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 0x49bdab33f608f832b99fc7cf25df72281e873c891863a0875de9b288f4f5bf4a. 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/GRHR10972801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c2cde9107a57f801e79710c44b822a241f85013b51e6c2c4fda812ff662487. 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/GRHR10972802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32cc389d28be4d97ec2673ebdca5367e1238e86b8c0de43514b6764e9771e517. 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/GRHR10972803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49db61f20fcbbf0f4df20c27806f85415925868224a1fd50831837abc36d2c17. 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/GRHR10972804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d79a01aee5b19e7c8e5705f548cd404c84014728a98aa348e1d807b6edd01c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GRHR10972805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27dbd2df34a2aee13b05d8b79438bab39b023050efdc860b6d20480b6c5ca54a. 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/GRHR10972806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959d07a552e97cb3fe08c87544461d6510dc529d9b11631fb516a534227c1904. 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/GRHR10972807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3e3b9eabe399750a7f08189c5bfcb00c3f940d8edf9d2a2493303ed5b5c824. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GRHR10972808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b36d98907a4654c8df7caf848adfa88dd4595ab4056a55940f96e97195f52a2. 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/GRHR10972809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01eea174f17c654780300d5ce36ae4709a0177c27d419499d7c1ce71e708d677. 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/GRHR10972810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38bd6d5994270b7bf8f2b5d9c018fb47b9855a0cd8d9a383fe93b131573cc9b9. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GRHR10972811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2513a767f57f0f758ddedeba6bdbda5eb1ab21e24265dac234b7b88bef5e11. 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/GRHR10972812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d45cf8fb66228767b65ccfd416bcba8fdb63e4c9611aaee36884b5befb8681. 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/GRHR10972813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832ce512d8a9fc10ba68e28c9c6554236aa67a793e7d9e36077ad5ea5b1c9786. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GRHR10972814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4653d39286bcf77b4afca64dc41a92828143bbe17f21f11db926064b1db05f. 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/GRHR10972815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff463425d638c57ad9b85d637db9cd12c4811689fd669b322e8ee3e314f399f. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/GRHR10972817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266887003798d34b26410ea7303509536353dd4f4be79e0e0ad52ef8b046ea90. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/GRHR10972818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127a52d3edf16de735eedd18036c903d087698bfd8fca4869d7d3416fae65fe4. 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/GRHR10972819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6690f96fa24daf0226522fbc558492e29478afab515251086f303eed3b72eb50. 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/GRHR10972820.