An April March was a Canadian alternative rock band formed in Kitchener, Ontario, in 1989. The band's last incarnation consisted of singer/guitarist Danella Hocevar, guitarist Chris Perry and drummer
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 0x9e4768fe892fdc98c8927a598e7b1dd57b691dcb749b00b27dc698eb60b6668c. 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/e44e385c-2fd4-43ff-8875-3af3df75ffd7.json and https://artists.proofprofile.net/proofs/artist/e44e385c-2fd4-43ff-8875-3af3df75ffd7.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 0x6bfd0a9d1a2fda49031cede5c53a9d86a00525f6714ab40a0bf5b65c6af7e289. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/SEYOK2016419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0605c8af6bd654e097bf84379400511bef33d45e0bd565a96ccb6539ebe381. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/SEYOK2016420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe1743365f390190c5ae1a0bee34c21025f580e387e92f5f7feac36ef2a7b21. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SEYOK2016421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6b1cc97c44d5209b6fa7ff00a0894647745b11d2ba6bd2ff82f208754fa32e. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/SEYOK2016422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f3f776696a615255923c20683fad8de49cfabe9c9ba81073023310b8a9de4d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/SEYOK2016426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c269758d7ef156177176d087561b7742d77eb746bb43725b5c8e13a36298c1. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/SEYOK2020037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0012f0a7c7c7108b7661f1ff61bf400e4a6811ca4a3b3bcb5db2fb8a460e258c. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/SEYOK2020042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bad7479b4420c2e6bce73ff7c679b88fa5f01daf9bcc2732dedcf4c9dfcc26b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SEYOK2115540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2394a828b405342be8c8d552da2a38e0dd9760ed9d99332e0a7595669c3d8cb7. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/SEYOK2115543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddaf438da8753e7bcf6c5d600d30fc45cc613cbb599deb905b2efff1b0b96b4f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SEYOK2016435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a57a5b12b8c125a4eb9866cf78b6ae20c48e9ff885a9677cad94c914c2deb9f. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SEYOK2016436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7451863a3fb09170bdf9eb7744c2f1645111504aa11674d12d5e5d4e92c24fd. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/SEYOK2016437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe906d57fc4f7f7eeea6bcab038b3672889e924b7cf622e01e40bb7149059b0. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/SEYOK2016438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50fffafc8e2c4e795fb9562cb62238cabd2d5001df112f0744f77c22efbec57. 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/SEYOK2016439.
...something once true, is always true...
...something once true, is always true....
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e5aa64bb0f0a5ecd8dd1d72a9f2ec4a76061aa0dae93e26ef0d428856f2113. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/SEYOK2517402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318cb77d621bcfefe30233f9a866f034c8c529fbb814af0a124183058e86c42e. 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/SEYOK2517403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580fb77a8833b0e9754d39125c6a8f9124b7c382e24b0de59f54a316032a9f5d. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/SEYOK2517404.
Cherry Stars Collide: Dream Pop, Shoegaze and Ethereal Rock 1986-1995
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1e87c8c3e31767bea6bbf6df1681c6d5ecf92e9fb94489e47e862d52c4f840. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/SEYOK2016418.
Still In A Dream: A Story Of Shoegaze 1988-1995
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed2ce1abc113094c57aea5702b096b5c8a82c233eca250317d8e8b74c3ccabe. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBBLY1504972.