The Books were an American-Dutch duo, formed in New York City in 1999, consisting of guitarist and vocalist Nick Zammuto and cellist Paul de Jong. Their music typically incorporated samples of obscure
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 0x60204e5a588ace63c7822f87c5b2dd393a3c8d4af4e57079ec75cd0e2167ab64. 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/c9282970-22f6-4dbb-ad56-8112b2890b18.json and https://artists.proofprofile.net/proofs/artist/c9282970-22f6-4dbb-ad56-8112b2890b18.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 0x06f83c616a81bbc9773b91d11232258c3c694cb2ea58cda0ce0c4982afc5cfa0. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USY6C1018302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85156922802d5219206c8511669857a09bd0b3122f7d626851bf4d44491a1d84. Chain 2 (Bitcoin): anchored in block 957616 (2026-07-11T21:52:36Z), 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/USY6C1018305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c18ac8e97bb379e757700cb64d306290135ce0ad1a53af2d106d029aa75b41. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/USY6C1018306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b740bf62c7ce4af9b43c03e705e42f09734fa7def6058f4962aaf9bc09010c. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USY6C1018307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78eff4d117629f3e18ebb47254b52dc0be03bbe6fbc3903dab5e91471cc67e4e. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USY6C1018309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f9992e980fb44cbebbbf1ec2d9aa9ad8090c8adf579a28f4f21330299a1d13. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/USY6C1018311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c7b00885eb64ed13d413179def0ab1c71daad008a5248c7b824a61a837c28e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USY6C1018312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8562c3ad39048b81ffcf1de0478389efb3f847517ab0c2623e0637c2b7aa95e. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/USY6C1018314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8aba5848ee34f4f054fa0652650d5abc3fff48211ddde2c2c1bf4e572cc24ca. Chain 2 (Bitcoin): anchored in block 957625 (2026-07-11T23:15:09Z), 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/USY6C1118206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee67b992990fae4839acaf55ecd1ae028da82320e3ad8a071e08b776676b6b78. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:19:07Z), 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/USY6C1118207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e95835361a60a1307c2470c4178ac750bd27b416501e37fb48c3de0981e72fd. Chain 2 (Bitcoin): anchored in block 957622 (2026-07-11T22:55:42Z), 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/USY6C1118209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa74610fe29a9c13a1dbc6b23feaf0f62228b9ed6d4768ede4e220747169966. Chain 2 (Bitcoin): anchored in block 957613 (2026-07-11T21:37:58Z), 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/USY6C1118210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6e6d4b4bdc22e491eb9f35884af5a7aced1a48430749995dded6613ff1bdc7. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T14:48:03Z), 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/USY6C1118211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535ea54670a5bd014f0ea27044213c8f310b0eb5fe38c8c6f1a41d3e7cdc21ea. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-17T03:01:58Z), 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/USY6C1118002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe686e44dfdcbf483573efa0cc57c6ca8661edacced4cd5a9c03c7117d02a2b1f. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/USY6C1118003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a45c2ef4105e65478c3f895f56072eafea0a8768a4b36d888be0ecc71cc9d9. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:32:50Z), 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/USY6C1118004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ec2599e5f7745ecd56c7c88a29adc16b4351399502d577fc42ee3d397254ad. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/USY6C1118005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d52bfb4681f679b746789a328e167243a742b2411a9e9c9fc50d527c5ee25f. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USY6C1118006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110aedcb4e6eb65d0f713685d1bcf46c50f26d5e1b9a0e397f3b3c1d6f1b7319. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/USY6C1118007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f030867a55c66ec77e506bba6c8d592b1242969786bb8ece7f345aa0ee89a8. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/USY6C1118008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccde069065168a410b4e6611aebe27320d27241e9319772cadd2ac5f2bdd85db. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/USY6C1118009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d3d56d37b56d944ed4ebcb7a973cfcf154798aab0de46a084a4a53dbd65a40. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USY6C1118010.
A Dead Fish Gains The Power of Observation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54001fc986e31a113dfc7bfc70b853737b63e6be8692bfefa5f973411b7491f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USY6C1118011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b525c83de4e8618e2d9e055062756457ad70476f1547b4e685e68d008146c0. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/USY6C1118012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fe09b49b431d2b463102ab826ce893691a57b62f6386ec692751d4078ba437. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USY6C1118113.
Music For A French Elevator And Other Oddities
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572efde8974de6c32866aeb8f5c256176ed9f76c6d23d84eab124c3b79ca5085. 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/USY6C1320602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d7aa95016f0585f371b58731f0cd4c7c82da257def67c50539f61b5670acc9. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T02:42:10Z), 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/USY6C1320603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cdccf5e9530d2e7810e54cc82a18c1c967cd42e70ff90b5c7d23ffd20bcc976. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USY6C1320606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da5e293f59abb3ef6fc34666c4662885e0ffdf2d08c1dc786801cbe2dd2a728. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:05:51Z), 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/USY6C1320615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c53c5efd088f0374496313188ab7e8d8089b5a7417dd2bf19dd5c343971b7c8. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USY6C1320619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04fe068ae17a912501cf9d6e7b7c4afd52a3fcd6073f605ad6d84d18a203b28e. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:00:29Z), 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/USY6C1320627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30274928651ebf0a34e648ea9f808bf1c08f64b8627b7fc463d2a865b53531b6. Chain 2 (Bitcoin): anchored in block 957613 (2026-07-11T21:37:58Z), 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/USY6C1320635.
Dark Was The Night (Red Hot Compilation)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8f90e8ee024a5dd0ea375a0334f7ed272e9b275aea30b3ae994414ba4a6b09. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBAFL0800170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e1973105e67bbc465bc989419600aa38c073ec3d6e357402a4d7fb1e7a0aa0. 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/UST841504015.
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