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 0x73196b21c4c77221e4d757cd031745a4761542fbd71706aaec5f18fb2ed45885. 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/b05d0b92-36be-422c-aa9f-bc3be7ac90f7.json and https://artists.proofprofile.net/proofs/artist/b05d0b92-36be-422c-aa9f-bc3be7ac90f7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pyotr Ilyich Tchaikovsky: The Maid of Orleans [Orleanskaja deva] (1946), Volume 2
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 0x0ca2a5925edbce45f6ed1bde341f0196232649390a3fc567740ed721afa79825. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-21T16:19:02Z), 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/GBBBB2011801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb02acd11f023c1ed7a8be026b06d595377c6964eb581505d3d36e5c7bd89be. 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/GBBBB2011811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c11ec9a8fb551153206ff8ca5752168d6fafaf9702f53dcae762c5218d7374. 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/GBBBB2011802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e008e7bb91b01a68b1577e66d9499759b45cf6611ea192caffc1549b403ba3. 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/GBBBB2011813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34cf8131577f85956125f51201e1de2b379280e01ee83ec392d23e7bd7bc8e0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBBBB2011804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c452ef4383d47fb20284c56b901cffd655f625a93c5ea84bd7b7d81f6638985. 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/GBBBB2011805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf4e27c0fe6513a9d9cbf8ae65ac396faf51dc751faa763dcb0b1ac5f4e2309. Chain 2 (Bitcoin): anchored in block 957013 (2026-07-07T08:31:11Z), 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/GBBBB2011815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6843d389f21084dcd3c696177b995148ac9604eca7f06d269e4d6a778f44137. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/GBBBB2011812.
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
Requiem: IIb-c. Tuba mirum – Mors stupebit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756567fc003d9f481d27c35614251de523c40f550f0082cb9f29d4d96e97e834. 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/GBBBB2011803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5061f19603358ad8ce600101183e6fe4e306eb85f42ee048d28b4a4a0c26a7. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/GBBBB2011814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8177ea962bf8ae8ef6a092fc0ad0fbdda54f9055b48d9576bce33f2b3afe8efb. 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/GBBBB2011806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78def742158dd5f1230f8eaa1209c33839c102ae7b3e147eb4314158f4ca737e. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/GBBBB2011809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18410973e48acea8b88ecef31bf03c6c62baa101a20a4db3f75d56fc54da3b8d. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/GBBBB2011810.