In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to late 15th centuries, comparable with the post-classical period of global history. The medieval period
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 0xee943eec8e2a8452257b7b0c8d48b71ab6f9fadf5a642ba0dcd1ac324b7171fb. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ad088ce-ea25-452e-bbc6-c4823ef30089.json and https://artists.proofprofile.net/proofs/artist/9ad088ce-ea25-452e-bbc6-c4823ef30089.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a8481045266402e74146d0c3d319047ff5b01f7e8e0e4ca479aba0d84042a7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:41:05Z), 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/TCAFB2086074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd752a6efed81e5b64aad04ae6dd8f6e2d8e8ebce8b04ec366d8509f646f66600. Chain 2 (Bitcoin): anchored in block 956485 (2026-07-03T10:53:04Z), 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/TCAFB2086078.
For the King (Medieval Jester's Collection)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed095191a2c658c1501226fb2c3215ee248173555002a27afa18a557181b02cc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZMEM2158709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d91918f237c87a7a8dbce0b11a40f2b9b090e05dd4698519cb865a501577062. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T15:54:23Z), 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/QZMEM2158712.
Out of Blue (Medieval Wizard's Collection)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e2acf0a63da41cf5aa08dc5d8e2b0b2cc64e5badec69f6f534851ad2cf26ab. 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/QZRP52378171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699e71fb1dc88866e6e2e086b90c748ac3baef116c3f45ac3f81dd21fc7ce442. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZRP52378173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4066e0883a8875418420d75dacdbc8d93f401568f65bc5e3f3c9923a3bdc45. 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/QZRP52378174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a59cb7eb530c36fd3c76ce2cbc01fed0de9f58db30c2da65fbd5f3746971f7. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZRP52378175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5714e8c4a23be861faf4fdcc17aea59161da08029fc857f20727cd4ac79eef87. 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/QZRP52378176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7955582eb01830a5ec4f7bbb5908e1a14bbcc717569f2de4c2ffe5c138ce01a. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZRP52378177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2a85350e7f5510470b4aa73f0dc79a03179a2c838446ccc686e79e8f019fd4. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/QZRP52378179.
Old yet Gold (Medieval Hero's Collection)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fb4ebbcf37cbb15e1dcb9cead942da114c40b781322732ccadce62e6120719. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZZ7R2516694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d1160c88861e07823485dc6f51cfc800cc34a3f3962b0d99050af0d95b9dc3. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZZ7R2516696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406e24558accb42060411fe6d90147b2bc07478ae491c4e3daf1be147decbc62. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:11:08Z), 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/QZZ7R2516698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0bc114c956669e8d65bd8a745b7f9b49974f998059a7153f3a430add4b9b5a. 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/QZZ7R2516700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62266b5b028230770110643cd063b7b266e7774dc60add3970dfadd3a31a359b. 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/QZZ7R2516704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6158babafc1a6fa9ed95af25536410d37c18c04dfbca370cceceef9de3471700. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ7R2516708.
The Twelve Days of Christmas (Bardcover)