Watkins Family Hour is a bluegrass musical collaborative led by siblings Sara Watkins and Sean Watkins, who also form two-thirds of the Americana music group Nickel Creek. The group began in 2002 as a
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 0x3459034950d49c8aeb0bc73378891f11bcabef3a8213f8b75b86d8f1751e0f5f. 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/2fd13bff-c222-47a7-97b4-0ba0d5b98a3f.json and https://artists.proofprofile.net/proofs/artist/2fd13bff-c222-47a7-97b4-0ba0d5b98a3f.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 0xc373a363a6e7e22d31e6da85823286d711f07ed0a52b1859c09e58bf5ca99ec5. 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/QM55K1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e48279e26a9aed757254705e310f4149d14b6108d1bc47c3116a818d53026c. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QM55K1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33626f43a0f2ca51c9424c22f1afe8b29ba3ffee90562efbe0ca99901502238. 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/QM55K1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0cdf53b146efc783c743c3a9a952b5076afe6196fa4703b785bccf3d4edd299. 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/QM55K1400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502c1714ab8ac64d71c2efd40ecc45a9f49686acca16ff4c552bb431ed287d0f. 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/QM55K1400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d894b0a525eabeb79eab72046e2e8c216864f407384329eb141c7e36499f7a. 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/QM55K1400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100b1b28720b72aefec5441d155fd567cb986fdc674d0b2c9c3541a05992ddae. 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/QM55K1400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c774ba2fb8ed5f587cecf87aa361d96cd411b50c9a1070efb397ae7a2d6da62. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QM55K1400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06bd2461a09ae764f9b7b27eaee0b8bc756294f8543ff2450545a2ecd1ff015b. 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/QM55K1400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38948e9979deb64d6e11f3163bb69a2530ea1deda6614f3d46781b4d52614710. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QM55K1400007.
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 0x440fbd04ab2582c6f6059299461133644733595c94d008646089c453ca431486. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QM55K1400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4289866931723b3f1185a50f2048bd731f7c4448a4cdda854f8039a5a527ce. 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/QM7MR2000441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa321e9f38aa75ddcab8732835c28acf0ee3cd8b3071a05afabdc4a8ab71df8e6. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QM7MR2000789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91f733a16a01499e97cf572b00bee2d1a41fb7a7221bd616e66caa4c4ed76de. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USUM71920722.
Home In This World: Woody Guthrie’s Dustbowl Ballads
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6f9bc10df466d1b083c6e1a1d9076600672a6c6518d9a25e826f178ce86c9c. 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/USAT22103787.