thumb|right|The Arnolfini Portrait by Jan van Eyck (1434). Among other changes made, the husband's face was higher by about the height of his eye, the wife's was higher, and her eyes looked more to th
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 0x2e8ceb4b0417d85d6f368996d7383e0d328b9b31722e655a1f0c362a917bb848. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa68873c-8278-44b9-ac0a-cf39a9c9df44.json and https://artists.proofprofile.net/proofs/artist/fa68873c-8278-44b9-ac0a-cf39a9c9df44.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 0x5feae3f34eddf348b98954f48fcf6180536a8b686f49fb20ac963e059379098c. 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/QM87M1502901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1433d28b3de70982515101ee280e40fdde3b05a6044fee16c3292461e7cb620a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM87M1502902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751f329f3c384e09b9c5fd6b42d2ca116732ac734b2ca0e8e09855de5dfd5edf. 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/QM87M1502903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2498b308853c1f165695a27814a3e83c9060775188c8ad98c7e6f0cd2941966. 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/QM87M1502904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9fccc7fb200e2be74ffb84cde67ef314a76a50e7102dfb437487d8adf4e2af. 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/QM87M1502905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d8164561aec85600173d335b8b367c8842db1299394e09a5fc1e9931a099b7. 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/QM87M1502906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2922953f91d535126eca5076b40db89fffcf7c91be31a9cba72e50e0a8e7f1. 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/QM87M1502907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f6db022cb6715a52dc133817c6bf2b5b303d436411db555cafe18643893e8b. 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/QM87M1502908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b5ba69b90638cc7c8e024f8deb336eecdd5f58406fc71d53ff6c4da39e58b8. 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/QM87M1502909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73f277e267d87df91b25030efd39f266519907daf0f20e1a6d2634b1081010b. 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/QM87M1502910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6befa11942330eafff3c8331da1fefcc333ffac2641bd9abc6bc591f5a9c5e2c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM87M1502911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef524c1411858bad9e80e0a86e14c4dc51d3803a9fa3ec0ee4837e46533c805. 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/QM87M1502912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e476a714a8de41eb16e678c333aa9b68336f66edca3cb5674f7a377567b3d06. 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/USAAT1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdc08f78d1a53f6f01db31413f342779014324e062f49c364a6649d35102442. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USAAT1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6bf04f4c31ecf3c52bcf5f223075c96f8e06ed79459cfbaf6cb30e4b150343. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USAAT1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a28a368febe38164a5efa139b7dad1e4aa31ac4ddf0ea53c2d25be89f2b2f7a. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/USAAT1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ffa80102f624ac28c7953cd90fe46e32d29f818629e3a9643fb95436faff1f7. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USAAT1300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273962bda90550be89f49b4e130f540319e29c7b1b68622cb9da387b2b0fb12e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USAAT1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61affa735805f6b574d4e73c8156eb9507e66099f25c1b9233635bc6004342e. 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/USAAT1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd2e2fdf533cce506fc6789b318a79f9e9eee0e86dd57a9fe543f1f93a5db67. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/USAAT1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50b29d12fe044bcb35ebe404491340ce928564c608620227f44bb8ec1065643. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USAAT1300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb638e965e835de19aaccf98917168075d022b158496826078cccd0a330bafcad. 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/USAAT1300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48e24f48d55993bfdc77615e989aab62a0ebf06a5dbd71c63c3508f508fbf33. 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/USAAT1300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb943d0fbe77f990a4bb81a7c9e62cd8d4c0da6b18c322b3bfdd12227ea3b3bfe. 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/USQY51262146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8662cdcf113d5f3ad98bb7023fc6f2dc525dfb2e945714d60eab40df665b9ada. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USQY51262147.
The Places You Have Come to Fear the Most
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cc2ed5b558b749067a19a77e494118485a23fb9fd23fbc64e8668ba2930719. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USQY51262148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebc4a3686f4ad79b9d63476a6201f3d1fa927899bb594f7963db40f737c7367. 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/USQY51262149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c87fbf4bf5ceb09b5fb87ec33d8dc32a52b4407da7c9fb6334c2d5f8b238dc. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/USQY51262150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86dfc5dfc868f0a75b193cf09c909ecd48e98e7e5edd11fd3f83d8a28e27d57. 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/USQY51262151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20ce1f73d9d8a9b73f612bd3e470614fe9adc9c225fa288cfe4d5745878f81c. 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/USQY51262152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3464c684da55989218a93e4d98f7ee3f2c55c5b89ecc36945ff4c1fa69c64e75. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/QM87M1502702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc325550f957aed85a2b1ddeb030dbf62ca99de07a697801750debf56ab40022. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QMFMG1355738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560b0d25302d1749b23b5d776aefb9de7b93567842c93bbbc12b86c1dd700e16. 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/QMFMG1355739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308f81a758f66b1bd2d1345d0025c007ff1875d2f9414dba6b6b81bad40aceae. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/QMFMG1355740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6796d5cf58321872f53f479a932cc104eff186adb14938e6416d0ba0df6081. 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/QMFMG1355741.
I Am Shark: Confessions Under Water Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc249209616463f2c3aa88aa6de4aa85e7cf5c279b725a152d0a72cb96dcda935. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USHM81226620.