thumb|250px|The band with Bing Crosby for an appearance on his CBS radio program, 1950 The Firehouse Five Plus Two was an American Dixieland jazz band, popular in the 1950s, consisting of members of t
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 0x9b6fd173de0a2e5e2f7f9483a5c2e5499763dea0d2bce7d1f42bba4cbc17a216. 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/4eaf0513-1f5e-4a4d-b629-e35903ca8eb3.json and https://artists.proofprofile.net/proofs/artist/4eaf0513-1f5e-4a4d-b629-e35903ca8eb3.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 0x56f98167e6cf01357f80463ab78ff2a7a3f1012ddaccf466f7eac409d9e423ad. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USFI86200415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f027c0f65badbb3ef0b0e7a6c65c81f314e3e7517dbb9b29f54043ba1a77012. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/USFI86200416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9978d60e9e009394f1f4daebb972f9ffa5ee046f11738f7e22ec8a3d328b8d0b. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T10:55:45Z), 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/USFI86000669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efb85c8558dd6c677e9527fd2fe82283803b813d361ca500602824f7aa8ed28. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/USFI86200413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952dba74bfbe8a2d05e9db93284d9a89912b97c66ae475291791894d596c434e. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T17:42:45Z), 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/USFI86000670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e83e8e41dd85d371b205af9186f31358c0b2c23edd689725540823348d64f3. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:42:36Z), 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/USFI86000671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7d8ff7648ac730b7c77a91c7fbf632ca50088eae46e60c76120cdcd73de8af. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:10:04Z), 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/USFI86000674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfa23725994fabe0c93230a7be340599785ebbd9af5fa6afd2fe41f395f791f. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USFI86000675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9de571e22cbd08fac3bc4aea1157ec0a2d8c171097fa08c927e43e2911cdf43. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USFI86000677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa04c7bd6dccb830d3d83f97c15fe672f8f4fdd7bc28acdb6ef616f5f9f0471c. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/USFI84900079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5734b5ff66407449768dd329d75f8ba0b613b87b50e7ce72b70e27b2a8bdb6df. 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/USFI85500385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670ee1268ea39461d7bf5e61d15815b339e858450c95c0b2763f562436b609ec. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:05:54Z), 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/USFI85500392.
Settin' the World on Fire (The Whole Story, Vol. 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c5f1d10d358beb2aa7c6030e22bdae0d4427905239ef8a5de3a031cfa187b2. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBDAG0503021.
The Very Best Of Firehouse Five plus Two
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97f3bb101a54c92de45ebe766c0695510e58e2918c616f982eb5dfe1b10c51e. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/GBLGL0988489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc84534ba13802cc5676323c1a3ccb57aa0ca5d7b8b7ecaedd0836080541081f. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:22:24Z), 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/GBLGL0988490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d02319e6fc1b010847e22e22a9c6cecd827875b15bedf97e6b6d40feef20281. 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/GBLGL0988493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10184e7ae0a9e6ad1181a4657c716ccbe22cde8f513444d4a16646bd89c637ce. 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/GBLGL0988494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd76bec471096169e5da47c66b51bf4d3d0b4c806beb26210be111ec9821727f. 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/USCXG1200142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3167f67c956b9e82d95c3bb47038ca8c3224c98bcf9e88572ae683a3d9b2dc00. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USCXG1200145.
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