Cadallaca was an indie rock band formed at a party in Portland, Oregon, United States, in 1997. The group consisted of Corin Tucker of Sleater-Kinney (vocals and guitar), Sarah Dougher of The Lookers
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 0x218c23da0d68d9dc12b76049e5d8376553c0b1e6fb18a96a7240735fece025f3. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bbb5f867-3dbc-426a-8eb2-da9abf5f0b69.json and https://artists.proofprofile.net/proofs/artist/bbb5f867-3dbc-426a-8eb2-da9abf5f0b69.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 0x00f4326ed9d23ad147579d539a1dc826770e96af5a4b8dcb50a859ce5f4b02ae. 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/USK110408601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404ce2c87df44c6bbfc99d9e0ad299c4578d7f65bab40b1c2ddd124b9e65c876. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/USK110408602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0c586400c952d15fc19d6bb4e867e036a0953894e7cb199dfc5ad2a12cceac. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/USK110408603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0f80f4d90d4bbbd25f8cc9c046da09e839af6401f5bca4fdfa50c57f71c095. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/USK110408604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0119f15327031901676c657ab52c4b23ed67fe51cc317aa97b138b718ca02781. 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/USK110408605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1924931e1f9d174573c57e27fff2b9da6522ed1948fa6dee80efe38909892669. 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/USK110408606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9138360ccf400f66cd29b663f92f681212ce5fca64301fcabbb8e42d084008. 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/USK110408607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4281307fe7f8e3e7f659f943885a17ba10ba95c484b69cdbd90ff393f9cb1c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USK110408608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf92f58d6ea8a4c2fc9b3b571740a7a897a0c8dcf35ffd513b181c622bf68980. 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/USK110408609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c94dd0c8d3e00c56ab76c221b0d6e9c2ffe5595d7cd917e2766f0409bda9fc1. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/USK110408610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7228da5b927e3ac6b48d9dd220b496cb5663b85bea2b7b081725ad41ec7aa6d. 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/USKRS0336201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d7ae059f8e5695d5dffc55441305845b4b76fc10a926a0b4faf6421e64e4bf. 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/USKRS0336202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f2c4021bbf122ffe25d1972067a62ff4d4fdc8f5f67146c43aec82d24e5411. 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/USKRS0336203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb983352ee49354602f9dfe1e67dc698aa7f8434ed39f4c7827427c7cf9b7741. 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/USKRS0336204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797518539e81ddb773ae91a7de57223e7ee65d010cb0b82ecb2fda1c3ea7b8b8. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/USKRS0331803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efe9fba264a895e2e7f31a23b73c39087b40eb4fff6954ca38936a7ff841caf. 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/USKRS0331805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58d0ad267ee47e1097b63a6bf6b76c305f9073b838ac603267c56310a8f25b8. 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/USKRS0331806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fd161fe0da413bf593c4ec7588babb1c5f36dbee787f9e41e89b2a4ddde6bb. 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/USKRS0331813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d81fd582295f6045993dd521fda7b716f58bd141c467b0ad205d25acb24d9e. 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/USKRS0331817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6789a620ccba26ee6a7b232dd0cae7640555409f7d3f79feed90b4803d54f357. 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/USKRS0331905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b24bb7368643f852ee4394c61ca04df8384701ae8c7188d448e3867f426620. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/USKRS0331910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd9ca8bcdf0034db034a377daa91ebfb50eefd57e85d30b3e6d701de84b97c2. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USKRS0331918.