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 0x49addc858bbc4c08fc509f8718485fe8938629cc7d0c68117af429d7b2f69cb2. 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/273cf793-5ea0-4ea0-93d9-92dc47380477.json and https://artists.proofprofile.net/proofs/artist/273cf793-5ea0-4ea0-93d9-92dc47380477.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cantigas De Capu - En Las Calles De Barcelona
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 0xdd3469b013effe1cde97c41aa310f24235a488cb52fa86e3cef3a408e4546fea. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/TCADG1777358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2369f3a6e91f4bd47a6a839557e0219f7b594ffdcf82565e8d2fd5b9444b3fe0. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/TCADG1777372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c42ac0397be099a80dfa67c5e7ffacc9b71e7117e9eb4d3e866356747bc14f. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCADG1777396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979382788c5c924d2911a69ab18dc4360969f3f7dc718e0494275a5176820474. 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/TCADI1742453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609a54d53a67eb2bed7e61099f1ec7ab019237bff187e055a930a2d9ace00421. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCADI1742459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4be044b202c9874c558628e4b841c5bec855363dce5c6b8473da1b1dfc2d079. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCADI1742480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2016a127f4798d2ff6d959a6c756aa0c78f8b0dcf0cf1eb4e4770594e6e95a4f. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/TCAEL1973524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2ccf77ed553963c3a01f5e45c352c52eb958a295ad7c33251b9dc830ba9fd7. 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/TCAEL1973564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071c69ee425fc54964331c1c37c9afa40bfef9d830560a7e73a2a9a6ba326429. 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/TCAEL1973566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d0178058ed85fbcc06c2544d390edc47e98ed592eddc0de5b248ad3006f68f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAEL1973570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a812ee901454064672e793ba2de4316cbaa4121b04b1abb8cf9a77309b37511. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAEL1973792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8388547f3d02058f4b4f2150a809044012ba49cf73241302f7deb5f925fb37a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAEL1973795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536e63c40b318fb832ea114d9b0d11471cf14660026d89ff9554f9a6b542b35d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAEL1973797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f99a6bde899f0053a8ffd9124092b3190ce14ffb49eb69d7266d7eabe6069e. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAEL1973799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a16d095ada21bfceb4b75530df52818575593d0739391316f4f807ffbd3803. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAEL1973800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1cd682458083e2493d83d2559737643d2026219c88f8aaca357f10abcad4b9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAEL1973801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85150899253691b94d70d7fc3817e133e1e26beb0cf7074b8819cf1ad3f2c45b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAEL1973909.