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 0x20a86a2009c4bdbd5f34311ef083a628837f86b49880334cb87d68e14010fddb. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4dacb21-a0fb-413a-be02-128941bcb702.json and https://artists.proofprofile.net/proofs/artist/b4dacb21-a0fb-413a-be02-128941bcb702.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 0xcc83a65fa0183338c6fdc4940cef96ac98ee166e1163f4dcf0e85e9f697a0a0e. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZRP42227185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93e93793c40f50727094a73138140fc5c0794cdb63aebc25886745588e40a35. 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/QZK6J2329059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb438964dc38a48abab45b867a7da462d63b8e30535854ee9a084a69b907eb7a9. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZK6J2329060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd309f3c9197d44cd2dcd4a4c837a944a3f60ddaa519a137caa71214fd24228. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZK6J2329061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b1109e6ed2012f34ff8c27b2493265f6d25594ff8b6b37d296d38bdf76f4e4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6J2329062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4362943aa1a50e5dd48f9596a1033d40567af3125f1413f316dec5c3a2dc3c78. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZK6J2329063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc19bcbc31f9a717e658c639bd4183c37ade128092baba8510415e455b96187d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CAHQJ2481668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa71b2d3c08bd4042d5b5f747cd2143e0a7d6b0ef4d044fd3f7fbfa3dfbcb93. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CAHQJ2481666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94b79fc92df367b483f5947c569ad44a20ab10b4bbde3a47765f207e5bb8e8e. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/CAHQJ2481665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8589e717448ba262bacb012233db830a5047080a49a7e49004649792807a1509. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAHQJ2481650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd4ed52d7add4122e8365b4182cc066789921ef8cafe4e7127000eee71f5671. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/CAHQJ2481664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a7c2965bf8d908b2d0bccd1aeb37c1c3ae0c78868af5c60b56f9a376d9f515. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/CAHQJ2481652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4ec2358636af05f146d1a2e6df3767b86577dc493d3c70964c0952476f155c. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/CAHQJ2481643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9110473699b468006b10cd6ac83f6bb1ddc8c886cf00522ea9c619731730acea. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/CAHQJ2481648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb410a1e82fbef09a1ec2de9c32fa2b307da5e71ccd08e1eb62e84a51651dfc73. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CAGOO2442092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd204f2f6915506312a5ec874d3ea9394b65db9c5e201e66e740d9e0174bd7bd1. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/CAGOO2442089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a1e0287f77ea65240e3c4457c764f07f66e96ed0d6f5cc9b6d928e85415e8c. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTBE2483025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492457294f10eec8c7d40079d0352ca68b6ef8a9208e999f290ea937b4970325. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZZ7W2454181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3a74007e29c6a51f0578d05af642d3d91d92a9f78269f752d867e0ba36e9bd. 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/QZHNA2532966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe41a6455fed5d07b5a80868390d05ffdf3b4ffe0c3c657e4c7abdda8fbe07c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZK6K2593435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfae3e51cc432c372fcccd1499109c5f2680055ff74099a27afc28bc1de822ce. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZTAU2579465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fedd89b17bc80ac6a41625a85d3fbd4a76bd5d293ee9377918f95010552f215. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZTBA2561672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc57e38a49b7464b58fe64618c7960105f32ec36e8e17eee57e46e7bad2d4e7. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3FE2591942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54785d4ac6694c1aa0b4d7217772e1d6bfffc3ecc8ed52aeae8c4f874453575a. 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/QT6EC2568462.