Eighth Blackbird (stylized as eighth blackbird until April 2016) is an American contemporary music sextet based in Chicago, composed of flute, clarinet, piano, percussion, violin, and cello (Pierrot e
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 0x358708bd92e2d3af46a486cd77d8b04f8f2f24dd38c0b3fab9cd11cb3d1c47db. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb700aa6-a0d7-4a00-9f12-511de4e2085d.json and https://artists.proofprofile.net/proofs/artist/cb700aa6-a0d7-4a00-9f12-511de4e2085d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Eighth Blackbird: Strange Imaginary Animals
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 0xf0910ff0d98cb24782200dc9973ce5c30d48fa44d6cf2b1f35b0cab0c41a3408. 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/USA560603717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5219f5778e27e44302828a3286797ce4446e039414441e8a394aac940ba19556. 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/USB8U1066990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4cfd0e76e00f9f9ce1765f0c05b492fc90c42ca4249145b59175c1e04d42f8. 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/USB8U1066994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8e2319a112687ef86bf7c55235814451de994282db51bbcf4ea5db80b2728c. 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/USB8U1066995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89c0df0f93446cfd4a232849d08df9e589b9240b15897305a54e5458dd915ae. 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/USB8U1066996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe914c1653730b6a5af00b2a58511b83b730d2ca3ee3611411367984a036ae637. 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/USB8U1066997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485a6ea077973d097320b68dc0dd5203e46bd6d8d40bba8f18f6ba2c3f162b65. 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/USB8U1066998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8bee5dc38130639320d35790b506f9383af3bb0a3bd6f1434e1de29f54606f7. 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/USB8U1066999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54165c2d2c734fc59bd844153325642336d676960a27fc885d41b4b82e02089. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GX8LD2236242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5466ddc042431bd5f7c03769e9504a72cac932db17528dda2a4e2ea9fb77c5e7. 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/QMB621900401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0263dd4bc0934049f24379ca40af8f5b8e54d269a256070be6fc7cf56cf18262. 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/QMB621900402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975629847aa061c41522292b54cac1d638b5e739d77606514f4a14ca4996304d. 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/QMB621900403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e5d329f639d3cbf85bbf636fa1434872996d4a2f4ff1e042481dfc97d2a14e. 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/QMB621900404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623979d72b019f8efc2dbdfbd579cea29d9b8f2218809b86cc1d9d0808bb4e35. 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/QMB621900405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44337b3f7a1670839eff3b71ba8c29d3c496822795790fb7fbe6deccceec966f. 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/QMB621900406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3e33cdae17aff437d21e1ee3f92efcd04eb371574e20a6c6dd1992b18ff664. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QMB621900407.
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 0x87b14a2f3e6bdaf56cbaa373ee318cd07bf86d45b13d708866a7dab761b46d8b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QMB621900408.