thumb|225px|Fred Johnson (right), with Christian Carrasco from the Earth Angels The Marcels were an American doo-wop group known for turning popular music songs into rock and roll. The group formed i
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 0xdd44d22180b94fd6f45b7aa201ab9f559e5ad581818deb1663f2216317c7aa77. 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/a7624830-c4ab-46c3-84b8-bc7ff1b9877a.json and https://artists.proofprofile.net/proofs/artist/a7624830-c4ab-46c3-84b8-bc7ff1b9877a.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 0xa835accc2abdb7381d8cc71db6588e721857e71756e8dd9e5235d4155174c028. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEXO52455633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c7dd12906bdc31d77904cd821be53b99e29ccadf79653106aa22661da44c08. 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/DEXO52455635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199c004cd66c3abdb23587f736a9157ca3160dd28650fbfc322dfcf46cd6bbd8. 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/DEXO52455637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaada6599a807352571926ce855fde7cdbf959be284a7ecc467726a832b4678f0. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DEXO52455638.
Blue Moon / Goodbye To Love [Digital 45]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cc7697dbb0a1cf03e5fa2610ccbb69c5f65f4f94109254b8f0694ed2d98996. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USRH10802817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1e0940c1c9f0770b34b90df6f1fa6a85b5e09f5ea4d3e0c33f4e83a1bf8586. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAYE6100123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a4181d91e16b1b6dee4c3e5779138b98550225f81c96fbdd92388ca4a921a9. 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/GBAYE6300370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa1008c84c4a6ebbd1909eec1633c70c54721e0439f508f80e101090b3c5f81. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/GBAYE6100652.
My, My, It's The Marcels - [The Dave Cash Collection]
The Marcels: The Extended Play Collection
Blue Moons, Heartaches and Melancholy Babes
Blue Moon - The Very Best of The Marcels
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522c8fa7552d462895ad2b828839426c144458b33d1662d95c09f05f13766576. 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/GBAYE6200787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6f7fb3800cc5f810ccba78f806f7af85738b06043879c7d55feff4eb01b28a. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/USRH10721383.
Anthology: The Deluxe Collection (Remastered)
Blue Moon - The Very Best of the Marcels
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d6865161a124aa1bea21204d93af2e5c8f9c785a598665c808978a834bf4bb. 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/ZAC482400155.
Essential Classics, Vol. 527: The Marcels
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda31a314b28738f0dbe8d7c06d57b9017827172f03d26cdcfc8e6fd7b62334cd. 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/GBAYE0400288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0694c94be5567f44c90420334023e777f03bf90a8bd5c6b9fa5b5f26e425c7. 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/USRH10300974.
Music Inspired by the X-Factor: Halloween
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3d15d0edbd3031df9baff2bb748a596e45471a48dfd0e45679d61654dc46b6. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USV291442830.
Radio Nord & Radio Syd Topplåtarna från 1961-1962
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca3440e016784231d4ec10d3c32fbf56a7360db4bfaa5df50c4b5a39fb01dd9. 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/SEVHR0900413.