250px|thumb|November 16: The Council of Constance is opened by King Sigismund of Germany to settle the Western Schism. Year 1414 (MCDXIV) was a common year starting on Monday of the Julian calendar.
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 0xae0275ce0655ca2173c0efd2b98308acabc4c1dc0a1c3989300582877cf462b5. 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/08e3b44e-fa87-4d8c-9cf6-3280ca08fbdc.json and https://artists.proofprofile.net/proofs/artist/08e3b44e-fa87-4d8c-9cf6-3280ca08fbdc.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 0xf1ef978a658438d05b02fb16fa53dc589652eaf731db1cc4e4bc4d9e19eb6577. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZMWW2007667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92819b581a4956a429077bdd70276b2472f116ba64239150e26f7d8bb9976baf. 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/QZMWW2007668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8eed66c99a70dbcff060c3ee83df403e96af1fb0eb0ddd438ebe2f619f93af. 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/QZMWW2007669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06d579e99fb8dee989581aa517720d85b260b0f3a2266b1c0796025658a2bb5. 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/QZMWW2007670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd06dc296ee091ff7a94c6c3e33b26def67cdf31d8527cb4c8ddc19813538c8a. 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/QZMWW2007671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2278751835210644f46858480d6764ef28f17f43ac90565988bb8a1148ee5d12. 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/QZMWW2007672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43045cd187cfa0dee1521323fa5e0c79771f4da6188c1d3d8b7a632e89f02f2. 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/QZMWW2007673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d856c8406f35e9ddba61c2d5ea40bb235f81a1f06ace57cf499cb3aaf8fe3b9. 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/QZMWW2007674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3334b342f85e9ba3c814ff892b7c9ffa919fbf0657cae9342da272816133898f. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZMWW2007675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bc83cd693036904f7568f5d5adcef42461b4107edbddc45936e97015597b46. 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/QZMWW2007676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2138a5d1eb7d3c3d923b24651a791edb63d3bd68188bc5608ddfd40e0d02b66. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZMWW2007677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f551c07d3a01b1e1bb7a66e1d5fba61f7bb30d928707347dae13a47bbbdb98f. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZMWW2007678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeecf34b292acf67aeed8e18b4f18d7571a390b39237c10cd7724de7de1654c6. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZMWW2007679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a69591cc133422f4f0cf32ab4b7b65732cf2f7ae24498bf6e478fa8f0aa28f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZMWW2007680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fca2c923828b8a5f98e83611b71180b3ade56879c219f9a67046efedf55238. 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/QZMWW2007681.