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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc004a6b0c4d1fc3878a5bc8c5d0a256f313a8a43caab56fa65d4dc99111de222. 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/d3cdf54d-1529-4c10-953e-3d3273caedba.json and https://artists.proofprofile.net/proofs/artist/d3cdf54d-1529-4c10-953e-3d3273caedba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Loquebantur: Music from the Dow Partbooks
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe684a996470f74af94df87c769b24ceae92ba3022b283f2ea20afcd450969092. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBEBL1516013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b4d94518d34c9e552973c18f90d2ea77a195a628684dff73bbad952dacdd77. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKI199901901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f521a66d310fd661e719c56870f755f524d2353175ddf8b602563a58e70d9aa. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKI199901902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9394541ec52340004c04d79e3471f84786a70a0e29a7a8c9bb9ebadec57d51. 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/HKI199901903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a527ee9a2eed38f3b19a9e3b67a91708256f19b9575a3f32e8af29828c5e1e. 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/HKI199901904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3702f1468fffc65cecbbc0f5e67a4149a5725de5daa7930cf7a0f2950524f816. 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/HKI199901905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe125a6f75484a82b5c4fc2c0bfbd37b11d924edd43ff12abe351bf096f08ab89. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKI199901906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c95770075d4a91104213bccea972d7ca749cc57e50870972b4d03714491deb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKI199901911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179ad69ad5c08da34b991c194e70d282a777d50386cc5e24a0d7ba7f76df6564. 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/HKI199901913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10771515d4905c406f4b76be2d095bb5c12fc84a1b429c7ea491c793d1833bea. 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/HKI199901914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c962cb7f4c33423e0211c52eec90b50faf01521862c91766c39c0e1d9b1733. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI199901917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf17fbe0620afde4eb4a50cdf682b20fb75552fc3bc217813b893894f2c18002. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKI199901918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254fbfe2206a6a427abf8f755bb0d5aceab89862c78f0fd1df1cd52d4905d381. 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/HKI199901919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96bd66b4607aae077262ad69af2d372484d6d106d9cd96171e69b6278c3d8cbd. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKI199901920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495ef56481c4eca4ff41a730c8370a5d3edbed18c378478f59b70c51c406969a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/HKI199901921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a74ea58f70dc3c71f69dccfb298d4db0cfc9d2ebb5efe36298179faf05d74a4. 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/HKI199901923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675cbed6ca6d46c4337dbe2089e5cef7cde59245485a4fac389f25c4bb359c98. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI199901924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc235bd381ad3982f179f2134f3e08ca049b9c45e4b2e85f2c9faf835654f6b. 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/HKI199901907.
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 0x9a15bdd670e4f405cc20fec0ef33138aadc4f53a062b52aed115a775aa7237e7. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/HKI199901908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe92e354ee9baf8ef3d734c6804893f1471453400d472bb57afd6683dae56849. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/HKI199901909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c36db52643c207fb7ef234b562a6b9c644077e5d4d555a310ff632a733cbe00. 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/HKI199901910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d024c9e0980188dcd14219611c9e22df188b38357ba39f34e29e8d7d73401a. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/HKI199901912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ba8086c06b3e3a6618ac992600c1007396e8d38a52d99ae8b808fdd80486a7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HKI199901915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34cc1e0a9f0e5f6145f39101c10a44d63291a7d0bf0c37e1778fd057c93f1f6b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HKI199901916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81106f091d1545702a3cf3f500f02f5d5b8d4c1d81b9e2cac470e0bfc64ee04. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HKI199901922.