Sweeping Promises is an American post punk duo from Boston, Massachusetts, now based in Lawrence, Kansas, consisting of Lira Mondal and Caufield Schnug. Multi-instrumentalist Spenser Gralla has toured
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 0xfc99e501f22f00d08a886767e68e4f1fabde3f49b6069929edbeb756068484d0. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ab6e89c-8af5-4fa9-967a-12fe07777211.json and https://artists.proofprofile.net/proofs/artist/6ab6e89c-8af5-4fa9-967a-12fe07777211.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 0x372f583877afe267f97077991f4a98691697ada1ca847bbab2388ed8d9f3d272. Chain 2 (Bitcoin): anchored in block 957834 (2026-07-13T09:42:16Z), 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/USA2Z2000991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785a8fe86701ce29b81f650f488627e65efe22332a170fb9e8e5ff71a611e163. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/USA2Z2000992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b30aa726805715655086b4edc037c48887d1ee92fcd8854c2afd46d621c6a3d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USA2Z2000994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d55d921954b32ac7eeacddbb8240cf626d71c6761c3858bbe1f28d71e2cde77. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USSUB2247601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1019bae36795be66e57048cede8a3a38576592b5b476d6f0e09c8da7f3a4d8. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USSUB2247602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54273fe5f3d505b55f0196fca6b56527987887337baa53c4e46510128ed216fa. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USSUB2247604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc33d76f885b1453d0acfbe797155a02b796c2693a9a6d86b38d68d00c2dd6a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USSUB2247605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598f32757974890f5c8a85fc70bb8d4ca4c187b2a2fede9a3e64962e2a6d4e4f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USSUB2247606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148248381eaa8a7524ee3bada9a36993a46f9a5bb7034883c84decf4e0a00685. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USSUB2247609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d55d921954b32ac7eeacddbb8240cf626d71c6761c3858bbe1f28d71e2cde77. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USSUB2247601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1019bae36795be66e57048cede8a3a38576592b5b476d6f0e09c8da7f3a4d8. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USSUB2247602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54273fe5f3d505b55f0196fca6b56527987887337baa53c4e46510128ed216fa. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USSUB2247604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc33d76f885b1453d0acfbe797155a02b796c2693a9a6d86b38d68d00c2dd6a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USSUB2247605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598f32757974890f5c8a85fc70bb8d4ca4c187b2a2fede9a3e64962e2a6d4e4f. 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/USSUB2247606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7397fb938e4376d405dfa3b30475455d91d317f18c94485e1e67042ac6972a6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USSUB2247607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7014dcced3d244ba92847ceaa4f381cf19e8364d73c5dfcd15e699d0acde42. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USSUB2247608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148248381eaa8a7524ee3bada9a36993a46f9a5bb7034883c84decf4e0a00685. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USSUB2247609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c09a2759c62dcf46bb005aa516a39c355eee58f6c0c95be1f813dde38cc0a10. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USSUB2247610.