Sleeper's Bell is an American indie folk duo from Chicago, Illinois consisting of vocalist Blaine Teppema and guitarist Evan Green. History In 2021, Teppema self-released her debut EP, titled Umarell
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 0xe814ba12406a14c52c03f59d2c2ad760a228cbd3f3b85609252a9444dd95e681. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec2b1c64-e1a0-4d5d-9edc-c71b46bb5b1a.json and https://artists.proofprofile.net/proofs/artist/ec2b1c64-e1a0-4d5d-9edc-c71b46bb5b1a.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 0x0cd2d0a0262f56e7f8c7f626549a4772ec9a4dee4d50b15d61a4c67a31a1153d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USA2B2404842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b368d0c585c0b51f69266b93dfdb43785209787cc61a6d2558230848727afe. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/USA2B2404999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d326b2fe14bb9d0886e0f8b63b9d95362038de348548d7514072a3ee51dc0c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USA2B2404843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210aec703a0ecc4b5bcb46690e33d0722f8320714cdc1c58e9650507efedeb19. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USA2B2405000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237d2b4a5ba91afd504e402d13e1206ea7b1c3d73d68e9a483612efe5e984ef5. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USA2B2402799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf287935e7a8f676a441f65ea47be76e18ab447278203ff6a3cd356b1b360f3d3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USA2B2404841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5dcb675a7d4f37117f368e0b506419d831a0493fe6e59b6ab5928bba371fb2. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:51:58Z), 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/USA2B2405001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21c200a3328bf4af356441db4a6c324014f278689926f9da0a9b8f2fdda08e9. 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/USA2B2404814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b1cbeb009c790e46b052d007f4a0fa1b5f6fd317ebdf6851177119dac9a105. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USA2B2405002.