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 0x3fa6b6da7664c73a10db2549269be13e338b39b289859d678aa00250c2d36c40. 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/5be247e6-1e79-434c-a1c6-35053dd7ffea.json and https://artists.proofprofile.net/proofs/artist/5be247e6-1e79-434c-a1c6-35053dd7ffea.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 0xb2cabb2aabfdb56b71c3c22f20ca1417232236b5b15b934c8a26449c030c63a3. 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/USLZJ2429635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0148e4d163f6a5200da0b9ace91bcef18eb892a58855dffb002d03335796283f. 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/BCNA52400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6a09583cb7dc1b2ada559125ffafc28ea6d1570a39b3557796fd7b54144a7f. 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/BCNA52400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0616f33c29229977655022c500d4235f66df0dc71789ff4f29757a2a4208347. 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/BCNA52400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b48ec7ca59096ff0d9ac5f76940b9279317019200432681e88dd762a32407ff. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BCNA52400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992f9970728fe48556a9755ece8e219e9c4e82b38a4292a7ccaca6e492a3ae90. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/BCNA52400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329ee31cb5fef3cf4ac8e3adca0ffa92f2003cd65c93b3d22c9430aa2970b7eb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BCNA52400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba2552dfd0c5fed6db3cf7bdd0943f168332af956fc1372b6c0c01937e10853. 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/BR8DZ1900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a8fecb46737968c00696db55da13e913fa60a014ccd008eccfbcc5f4c8ab14. 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/QM42K2005877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98575567582b8ebb7c3b4e759db54f60e81f9f92c2d88f137b92fc0445d9194. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/BCK9F2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb433ff8ba085c6ed5f191422cdac8afaba644bf6170a1d793343f38541be75. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BCK9F2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d19d2c419021d24c08d0cce30326f800ea49ec326dba62a01c757698483dac. 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/BCK9F2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73dfd80be4727fbc5784b8913cf43a80a63ccd86e039a28f58d37bd7e0fe9d7. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BCK9F2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0668da4a348e08c77e8594d39097471edd52b8ddb5d17f48117da4b3168ec4ce. 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/BCE7P2400661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd384a5a8230a37505e4fe6e2d2306327f09aded746d6e0a076a170bf2ccdaa9. 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/BCHY22300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56ec97eb0c900cee87deea6e427cffc1c7adc37b6612395024b027b95f84950. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/BX0PX2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d8038e7bb710261a750801428614e8460347eb26a7ff60b89b606d1026ce19. 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/BCE7P2400736.