3 Years Hollow is an American rock band from the Quad Cities on the border of the US states of Iowa and Illinois. In 2014, the ensemble reached No. 23 on Top Heatseekers with studio album The Cracks
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 0xc64a5456e2f1384c7c410a55b9aa833d41720eb310b9b2c9d92973edea61fef7. 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/dbfb0e29-accc-49ff-a25c-530c016525bd.json and https://artists.proofprofile.net/proofs/artist/dbfb0e29-accc-49ff-a25c-530c016525bd.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 0xe186be48fcc02f4294463d7919c90dd8dcb88814424625e28edb4e4f7e6ab64b. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/USCGJ0963692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a09e526c857c7ef3840685b6e747dd911caafe1ada6bfbb81fd2cb5570e8322. 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/USQZG1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ecc0714aeceeae7db392d5e8c597fa55c168cf353963a0a53e92ac9633ebfb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQZG1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7dfc5f157c62040af05ddb97ce484918bafba9d8e3915b92770ad7822baac08. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USQZG1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9744dcaaec3c4f32bd5579991122c98921995d23c1c8a59489de4546af3224. 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/USQZG1400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde15d622931018e80a1a1cebc8523c898373dd5a723a80eddba04c549d9f59c. 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/USQZG1400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716590b4680753f0957403eb412c801bb4ea8536a98d1b7177985a136b63c3cc. 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/USQZG1400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ff3ccb75154f1c655b9c188d3f20753eec92c0f694cebf3750620a19f5d130. 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/USQZG1400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00dc0cdeecead6384fac672ae44c15430d5c268a2f0e0bc92f123bad7e3c01a9. 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/USQZG1400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35f0d0654bdc6fc947950e146fa9c01b4c3d7d2b5b292c4286a887b8a7f6db1. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USQZG1400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69c563f75713baaf6c163ecd93a4b1ebd59ce62141ad696ab6416d7c4cfa886. 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/USQZG1400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6b67391210e42159548879af07e5ebb5da3ee823364b5c619a90c0c7be1c4e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USQZG1400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04fd5d4dbc7031b8b1f28d3fc0f4c930ca8b522ceba55a17c70303973460b6b. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USQZG1400010.
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 0x0688a4da76b38f1d88a015323b96d3498cbd3d66f3ce0ac5929a6b45fe171d3d. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/USQZG2115100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411b80a1b0bd7c3be531e5d18b9dc242ff28e58ef0085ad31fc39bde491ceb2b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US39N2304916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474bb15902e7bf2ef59ee87be800063412c2d2e3dc277ca784a7509e090ac035. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/US38Y2405799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f92bd4cd3c2f13a646b591c05ea8c0746b1cabd80443e7e6e94b0eb2dbbca1. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/US38Y2435121.