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 0xda679bce30cdedc088f0332e5d9f782d66868ae75c0ccd780dbd81d774ccef45. 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/0bf5618b-4a64-4849-a28e-e91b84b8209a.json and https://artists.proofprofile.net/proofs/artist/0bf5618b-4a64-4849-a28e-e91b84b8209a.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 0x60ef4cd289fedb0e273e655ecd2d25b2f87a5ba9ab8110cdbf2cfda41cf8577e. 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/QZRP42273205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec97f7047584705705eb962d182b7826c8d8d9d8f8162352bd1b881a81f7dffd. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZRP42273207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554863b306de7a4c0958b0b4813754eb1835f425c675145448f246e9ee191ecc. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZRP42273210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76edf70ba343556c3bd85534a9c1b1a069852f9352047d4b45d97380d8e879b1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZRP42273211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd669e7225aa99fa58bfa86036c8e826add9cc8b972801f32da8f4ebb3a98d6c2. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZRP42273212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca450f57b9441996bed17c122f9b2bcd9d24a26a9fe0af82c964195ecd1557b5. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/QZRP42254533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f088bfaabebe6b3d8fc7e73e37a083fd073b9146b2209b180b2fe31968cccf. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZRP42254537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba528d9b048bc4778801abee76fd0aac5f13fefd9fd4f665c2da276b29ef2bad. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZRP42254540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf870c7c240ae07dbf1cb6a2a54e8af610a30808d0ee296c7dfe8ceaa9168c19. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZRP52238391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455eebd689dd44573c698cc5162398690066fe7b133154274dc16265fd6670cd. 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/QZRP52238393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22234eecc56e64c1bebc14536ccf46a8d6d7d2eba48c99e152d6ea0b5aa5bc2. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/QZRP52238394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c4f4499a8b3d6966d6d57eaaaa9f1d912b132ec2cc6bb7fdb3056e2c43e2f9f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZRP52238395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3edfddfc71a4caa365a5d6ba289941f39103c04b150ac9beb92718fdc553e670. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZRP52238397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0444f670d1eaf105a3fe6cae7de46ca034239e95ee34a6da3c84a7e3a0bdaf23. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZRP52238398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162a25de5e314524d6f9caf34580d9172a00fae3e5ab750282001becf4434c60. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZRP52238399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0573cf8a51ab0d56e1586f3e853eaeb4a09fe17778a75c40877e52b644128a2b. 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/QZRP52209242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7450c9f65ec2f053cdb228973aef4bd749c3b517b04d3f45abed42148d4c5f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZRP52209243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38cb0bfd1a70d6dce40c54976016bfcb3418d7b8f9b7cde3e51102d91909b2b. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZRP52209244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463c0d046e1f9159d8768c66b1dbbeeb434b7659cc30028f6572dcb16f303301. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZRP52209245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf4c9f8c92372a4aedc1c1a46636727e25a3fe64bdd5b2a4724757517be374d. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZRP52209246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0dfaa23ea5946a6154550f8bdbee6dbf7ae2369f673fccc9ade88258a047e4. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZRP52209248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94884b2e6479109d84169d89328e7bf67cb705621ced0f1149521f6d6e145e2c. 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/QZRP52209254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0733e428c5f2686e235097292442ed9d860ef8570d0a5a530a1b50b68ac15544. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZRP52209255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5278a831f12793de4407369240ddf975d0109be5f5a6aae0cb3032a07b39f195. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZRP52209262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cd2cf91e413cb6684ab27d8eb8acff2f8f561a4ae9315641eb882b0ed91b9a. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/QZRP52257642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d511cd488123c9d980c2e2fe5e8cfc775b4ef7bab166549cd1af5daa7b49bb. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZTAX2249535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6fb024fe2676b341bd409f014f245cb26ec798894174df8a1f09b7d603b43a. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTAX2249537.