alt=Colin Vallon is playing the piano at Paradox Tilburg (Netherlands) on nov 17 2017. He performed with his Colin Vallon Trio.|thumb|260px|Colin Vallon at Paradox Tilburg (Netherlands) on 17 November
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 0x02c07e90a8aeda012af856f0872e1aecd4a6832cc43517beeece18c76d71060f. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be2b3cb0-79f7-486c-9ce1-f3973168c7aa.json and https://artists.proofprofile.net/proofs/artist/be2b3cb0-79f7-486c-9ce1-f3973168c7aa.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 0x0e1107c7f1aad2deaf6e71c6922c1cba9cf4619c377529969b3fff9097baadea. 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/DEB331018501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656d059c88787331284ec0a76aa479c1d5c4a72d9d5909ead8ab514f317cf15d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEB331018504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f3714a2c74a1d7a897dcbddfd289ac8b8dd762d25619c39752e4cd91d14f71. 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/DEB331018505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0729cd4fdc45191aeb6d4c3468008fe4bb72d2e895aab1a5ee372b3a4595f3b. 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/DEB331018507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c1f2e3192c9a8337f94add578d948c4e43e5c6d26dcb6a9154789f1fe7e21a. 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/DEB331334704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ea3697cd62d2cbf209e40d906bc190337f2a861ede1b6a1734cd424e0c57d3. 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/DEB331334705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32687da83805b5fe27981d1569415caa586c7aaf7a5d06c81dfe9b98f7e68d8d. 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/DEB331334707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56f6863a4afdc085c19b6d6a8b5e25aacc6388315f4330b84ff8f6c2a3c9e6d. 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/DEB331334708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a632f5f725ce93e7d22c8244967198ae226ce2e3e963c01dd3dec2eb8fbeba. 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/DEB331334709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9693e1b2a79c5b646b9ac6f885fc9a99532e86eac82dad71f9556b096b9609e. 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/DEB331334710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534e9c5d4e1142494197c0a5cd0ea2aa253658a831f1fb53b7e4a5d4c039d9b8. 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/DEB331334711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1247d395dd0a35400855f8bc4b888d0a6ac1545f6b16c327a892bb6baef3be11. 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/DEB331651701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04690ed464116e3e39e31fde8e23ad955a14f8ae27902c4525e0e109762b816. 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/DEB331651702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc654da4d49b7ca759fa0b00a370d943838c79844a578c39a70539a1c7c4ed1f7. 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/DEB331651703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6dcc69cdad96f409a3f6968fb29f8fa35d3e124fd4e98e0a66ce9a4bbf3572. 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/DEB331651704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30af278076233a4443dd0fc94b2950b86d7824e951558ea2f9ce3dd832d483c3. 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/DEB331651706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eddf8f1854aa13272bd274932debacadb6b417f185deed929b527aa35634af8. 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/DEB331651707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3e9c75d129165c31468bb740b0f93c12b6fb432f74e2ac81c12b80212cd9a5. 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/DEB331651708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755b001ec6c4ab0ecec46c3c86bf3e905736fcbe39e66d2e5aba7af958aee7ac. 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/DEB331651709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014490c03e8784d62af12e85fb033bcc49f65dee5a54679245406d1e1a01d681. 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/DEB331651710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8fef61bd0084950c9b74a11bd9a611c967fc33f2b74c70d5b7994ef2230b29. 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/DEB331651711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e32258c272a05e13286d6c69dc0897bafc971a9b3a772d60786fb05ebf988c4. 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/DEB332380902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74cb9b46d8c6271d7aecaef6a8c7ea342d39f1a96fafac0855b0c55dd3ccefe7. 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/DEB332380904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab08921aaee7e003e3a8c843c3414dc1234bce1341e0fe715a5db60c4377e57d. 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/DEB332380901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c88fddaefce11e464f942b5569b0d856fbf52f5ad0be73da33372d3e9ec75c1. 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/DEB332380903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74cb9b46d8c6271d7aecaef6a8c7ea342d39f1a96fafac0855b0c55dd3ccefe7. 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/DEB332380904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848dcca44d564f6f611b8d1f4ad8e6d7fab4c6b68562336d41ed92461e8e44d1. 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/DEB332380905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bbbf0c50669da675ef4395649870abf9bbd600ee681209062844719a287f1a. 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/DEB332380906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264de526dff8b6c0919ff8b050101a7dae722d7145be11aa64823db03bdd403e. 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/DEB332380907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3ee3b348936bd47a000e732b0ef0782a3828ad84f91a8ab4dbef60223e8944. 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/DEB332380908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fd91dad181f39c28f5c2f585204e8715f49f716c50a3699388d3582276d21c. 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/DEB332380909.