A donor in general is a person, organization or government which donates something voluntarily. The term is usually used to represent a form of pure altruism, but is sometimes used when the payment fo
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 0x7a7c7f98f2cea159e40fc0ef6cacdebe3fff064f35bd23f8eab0bacd469ee1bb. 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/0c88db7d-64a2-4c76-9ee2-e65154f5da42.json and https://artists.proofprofile.net/proofs/artist/0c88db7d-64a2-4c76-9ee2-e65154f5da42.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 0x6829eb1e686cf3449bfeff2e21aaa9e11a84b1d72e1bd645cf77b1b3bee42ce2. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/CZBK22400902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5c1534492a30f6f0a04c49c7e66bae96c860ceebe39700d00c54280f5b275d. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/CZBK22400702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102dd749f0e1c6ed51eea925ebe9a592a028836ddb2a57cfd36830279d1757b5. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/CZBK22400906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59610455b6c8fd82c5aaa690d3b3a4210eaf15ba2eb091547696d1b8596dd41. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/CZBK22401001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21aec29ff8c32bbdb97b2adc034a4eca7698b2224b801898307ad49bdf3345cb. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/CZBK22401002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c950067d07ed8e36eb8bfc035f6e72806f52bfc93cf52200f495a9e846a8d59. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CZBK22401003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9742b19874515608d74c25eb6674e88eb87330ee7a935e887c2746bef2838c. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/CZBK22401004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c27d9a1b3030498caa665f032cc5ceb1ad47512d9847beba829eb8a63ddc0ee. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/CZBK22401005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405429cbe541c65f475623335801e1e4aeb1f473e155b77dd16604510ada9016. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CZBK22401006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d3fc0a60df903c5c2566f9ee71ef7a07022098f2fcf8b8f3dae8addeb4f2eb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZBK22401007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90cf62654617a2f3edcc60f3e090a5fd448c11976ecccbfd542610cdf21f462b. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CZBK22401008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28512fc995c8ee4df3b615ecc0ad4c7d4f234e8ce5167c0509a1e00d96ef9417. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/CZBK22401009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ca054a8c14649e0349468b1a73677ab26e94938155ddb237e553ba867b7dec. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CZBK22401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3cb252a2c825229b9e4c572f9526856ac36d1d5d2c64e1a8faeb52722c60f6. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CZBK22500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32fa145a87d18a294c8bf42c9afc3b87f2f677f654c30bedf6781cbb1cb97c8. 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/CZBK22500109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754861782fc7cf5acfe7731ff412bbd26f32b1f236dd2653ef14f2ae4ff56dbb. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CZBK22500105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6e33bfbabf74c0ab6196389316cbacee12c2c7ed54a52cd0f63ee29af79f28. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/CZBK22500101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f422795ddf3fceca2fd9cf4986f56efd40fcef73163fbeb323b4f363e01be58. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/CZBK22500102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20fb9391c5135db12d3874964cf16dd7c57719a49395f4d9beac6a01ad08c93. 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/CZBK22500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3cb252a2c825229b9e4c572f9526856ac36d1d5d2c64e1a8faeb52722c60f6. 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/CZBK22500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754861782fc7cf5acfe7731ff412bbd26f32b1f236dd2653ef14f2ae4ff56dbb. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/CZBK22500105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1bc35e4cde23bc255f87b1462c5e61e04d3fe4a0abbd56882695e07f3f0204. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZBK22500106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf867723d1442f4a7bacf5986edefcda5be8412a9ba8e1594787b27dd87ca1c56. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/CZBK22500107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033f3a487a4536a3b15d2b6a3a1bb68e667d1855e0dc212f16464a2a364d0f2a. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CZBK22500108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32fa145a87d18a294c8bf42c9afc3b87f2f677f654c30bedf6781cbb1cb97c8. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CZBK22500109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696285d6322d6e757ba7626bcbd52b41c074c23345ef3d37c900f85f92f71d5b. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/CZBK22500110.