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 0x75855b055fc9ff5a975a346f71becc3cb3ac2461bef7cf1973ff7e7a13e567ef. 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/e6fac8f2-929e-4b32-8ab5-e396e091c21c.json and https://artists.proofprofile.net/proofs/artist/e6fac8f2-929e-4b32-8ab5-e396e091c21c.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 0xce2af3cdefe97d49227a474089867505aa07615f963bd73bd2df9ad1e68ca806. 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/QZTB82495291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827ea39ee67a7cfb0114d576d664c4ebad69dd19dc1b234ccb1f32cc91c4280a. 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/QZTB82495292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc75d5e018c60b39b296829bac755b45615ddf1d136c5ff84aac077ed40e530. 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/QZTB82495293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07da1b77c4190dcd6619dec558031fd47dccc286e7610501a1ceccb945c56e45. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZTB82495294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c3f2c5753f7ba403bc143984c3814f9b7ca5abbe19b32d5523bb625441710c. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZTB82495295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa725dbae325f747338bde0a84928b1a4a3cc30919c689bb5f4bc58f3bb099847. 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/QZTB82495296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89aee6c7f39104a0dfeab28855d181427ce04ae51e2f19f532bdbd8ddb5ebcf4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTB82495297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0730a331fe2fa0eeaaa5e9f122091cde5fd6a1fba9579a8479eed6a4f4f55192. 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/QZTB82495298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe6d8d896afde3387ce4be9bd0c6039f3ec4cf2c08f0865ba2830cd1deea4b8. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZWFQ2454107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9300c8f19055b15ec3635f08c8ea59da0c824b9f09fece6a41809667b7fbc0b. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZWFQ2454108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd93319d622d98bf541f5fafe8a0e78ae197fda1f9b3a0bdf6b744a24e8df2f3. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/QZWFQ2454109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994cf8f304ad57c8f123a996ae6522a5dcd1848a3448792f4b216bc46168c568. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZWFQ2454110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934f1166edfe6d36220a034f45362ac036882380e811dba3db7eaea5d8b856bd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFQ2454111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4368756afee74ac0983604a15df5fcdfe5a1d39f33d3ea046d577add5e961134. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZWFQ2454113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x977a6ad90232b18c5f65f27c7c209560f3da1359a36a2ed0f55ad556440b0b4e. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZZ7N2460487.