Walden (; first published as Walden; or, Life in the Woods) is an 1854 book by American transcendentalist writer Henry David Thoreau. The text is a reflection upon the author's simple living in natura
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 0x0d195760cafa2977bafee2a8a1c61d58719bbfb859879734d1744db3b6388eb2. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/574a033d-b24b-4369-97f8-6e628b382777.json and https://artists.proofprofile.net/proofs/artist/574a033d-b24b-4369-97f8-6e628b382777.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 0xdb37769548f379d7b410259ebf16d7721a7d6cd5c2499da5d595c44a9ebe0d73. 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/USANG2296554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc26cd0c6b8ce66ce00851d4f61f22371fc3f5c9f809318dd865a9ab0a72c4c. 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/USANG2296565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6b493a956a4d37bd64ced90af51ce985d9b55d7393785a58364f5be2f502cd. 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/USANG2296570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45cce1d77535f0b2cda9bb9b224fa4d7f6453dea67f9c6439e3bb88dcacd42cc. 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/USANG2296575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c713a01f1a37595f30b9a53c72fbb0af2eaa75f03de79f3e746915055b84d8. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USANG2296567.
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 0xda6f221d4a3394b6ebb226d178fa028822812b50c6b6398984a9b633de134b35. 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/DEH742426542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce95a8abcd10f9398fc4dbb6c40c84505067acbd98e87bc47f404f7aac386b60. 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/UKZGC2308988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e799491008ddb4c0b6dcce2f50af3265acb0aacfd7d33ec459eedbfa96377f. 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/UKZGC2308990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe20397611d3a56f6f78699a01f199af833bd3b731257e2145da258b811171d2. 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/QM3DF2210713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b99ee8705e3f210f638b420b1c901cda5475614086637aaab42268a3f179913. 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/CH7812347579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dfcfc64bd137904102829da192bb4565eb61eb031df2e753d6eb83ed04f5be. 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/USANG2260626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b20c18ed330e53e4a74ad766d0effaba245cdfc70bc316510bb194270e0f9e. 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/DGA052297223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe882546961c110e11d9ab1cf622facf16b870a1b1bdfc430e86eae6e39188d. 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/QZNWU2265360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ef3ca43af0380299e139137c1adb6987693ff96c25532291c8a33a5d4c7c47. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/AUMEV2391638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ef5c82da511910edde35502d8ec3408e5957fa9001848783648204ff52c205. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/AUMEV2391605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39248e112d7f0db23304848c1c757ceb198c832e0f214d6cf9dcc7c5a20205f9. 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/AUMEV2391649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4fd7b26b3fa624efdec6b21903ce66a5c09204beeaec50c113d6b046e08a569. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AUMEV2391637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178b2b8b4ddc5aa207b94b106b2f52669f4934d72ebcbf39d5588635fe04c766. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/AUMEV2391606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243765c4dab00fec611b790eff751ca3543acc711752686145d0cf31cab11357. 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/AUMEV2391579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28376a0e238872ea02b8b728f7b6d3720786d785e39c3448f6c6c4e1bad4780c. 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/AUMEV2391646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db4f1ea947bd3544d6b6efe095ba8151bf573017786ddf6097cd2c8b04f4f23. 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/AUMEV2391629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b9a617356d897fa2b9ef67a292d5513e817eea605d18dc16c2a8f1c86282db. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWY2320301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b17cf031cf7a0cf06e1de322cfb22699251dd582e2b053729640102f1174f2a. 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/QZNWY2320303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c63bc7cdda3c405f09b1547dd64d9a9b9c17698525ace1a98bd023ee3c86d4. 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/USANG2200241.