thumb|upright=1.3|An archivist surveying an unprocessed collection of materials. Surveying is commonly done to determine priorities for preservation and/or conservation of materials before an archivis
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 0x716210e1024605e3d5f3e353ef49bd31a3fda4fa08bb546e399a12b3c960d9ec. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99bad5d6-60fd-46c9-a004-3291a7fbcccc.json and https://artists.proofprofile.net/proofs/artist/99bad5d6-60fd-46c9-a004-3291a7fbcccc.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 0xd1722c123b48e31735eddfad418c88b4be6ed7353a7c3f5f5c7ec3048858140a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QM6MZ1949803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f9b179f8b0ea5ffd58545a489061f2e0938238ac82dd5c7acfcfd88966c7f4. 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/QM6MZ1949804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2771c24c7557ae1d6b089165f2a87f7f3049e81d6e0b9fd4be7497d30ba076. 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/QM6MZ1949805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37816f89f7f1973323c822d78c8aa5c0107392782084d2a01f1c42a57ef3199. 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/QM6MZ1949806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa2b555d7dc2fa76694fd209ef8e56f60d89498f3e9422cc07f6f865b0c26aa. 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/QM6MZ1949807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cb8cdadb9807e83a9476bf39f96397e8a2900d34be6e85690cbc718812edda. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QM6MZ1949800.
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 0x404c4141a966c275f4cc1189800187d04786d61596fff6979629a4b82d8c8e96. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM6MZ1949801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53c3671e762da0cf2b89b68ab7e7f073d23232bb4a7508eaca45106fb9bc7b4. 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/QM6MZ1949802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf230f3675e3c5ce30bd78802de9d72e1d2596cb9423117280422165bdb230c71. 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/QM6MZ1937180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52de94f8a0ca00b14cfb51d240459798e6d55f182dc79dff3fa4b81f5b513474. 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/QM6MZ1937181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc6e6b776d246df53070ac4aaeac84d0b3741736a77817bdfdfc8b6f658c119. 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/QM6MZ1937183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d554d6804c055217a8fe7f76abdc2ac213f4196fc83e09d830937727916f184. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QM6MZ1937188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35536e2dca1268626f4a798dbfde8ec5ec3ec1f92bf55977f07b117213d00eb4. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QM6MZ1937179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e92892e32a89931d54db3e00f5eeefe6bfb83fc2ca6eacd3da86a6ef4f66644. 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/QM6MZ1937037.
Tying up Loose Ends in the Cold Void of Space
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7972230a8c49b7ce8273e1dc7affeae5e7f39d91bd7ef08b2f05bcc206eef50. 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/QM6MZ1937039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb29c2e26f8cf478fed086b4f4361b092a2a35aa25a3aef6f0d44a27571959af. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:51:48Z), 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/QM6MZ1937044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c01d361314ad20da60decd9ddfd8336b41c89cbf61e0c2304dd6cd85f402d7. 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/QM6MZ1937035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744eaef5e4b1a2f02469881debb2e358f991a988815a64f1b9df10ee96a7b7d0. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QM6MZ1937036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e49298a926d5ede4073f922f17094be4a033496524db4c8645d7206c54c493. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QM6MZ1937038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34da11ecec486cee8cef4ada30f6dfcc00ec4a3f390129dbc1a08b3c00255182. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM6MZ1937040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79cd2df3927ed024fe06534ee988f16a7596f3624c9f75abf0ef0f60b9c074ce. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM6MZ1937041.