thumb|200px|A 1951 Berna trolleybus in service in Biel/Bienne in 1979 Berna was a Swiss manufacturer of buses, trolleybuses and trucks, which later also specialized in surface metallurgical treatments
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 0x09a7b1f44b8618d93f029270350550b32272edec1e0f4dc509031392f3d35871. 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/2e25b629-ba5c-43a6-bf12-9931e5d29fac.json and https://artists.proofprofile.net/proofs/artist/2e25b629-ba5c-43a6-bf12-9931e5d29fac.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 0x75251dd5baf33dcaf90cffedb2977185b0826e1d15ed1fc9a0711a548100d3b8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES71G2405276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e559e2fe08f51ecfbc7818dbae07252946afa250195176c39bdb6e165320ac. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES71G2405278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef70e5e4c0139c490df16f3213295d136d77a1802d3632c398b42d8bbe1c13b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ES71G2402338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d56171401f6912bde2ce54132c98ca9c5317a45c9c075ef4dd4f89a580128ab. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES71G2405280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d112293ae758f28f6a7a3aa8f81f9c66ab38450b16aa7e43c6163d7b9018f8d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES71G2405281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fac983fe0db022c72e239d9aec530c7395366890059934c056077db5acd880e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES71G2405283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6893de6f9abf85bcb13838c08998e12ed5533978b2d529a037e4b71c67930f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES71G2405284.
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 0x8b67497505f12747e4ef47fad219ef15ef804143e4b84d35d969141452dba706. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/SE6XW2148359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce1272fbd63d66771079a29d781ea1a75c60f332aa32f3e36abfe9949a3318b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SE6XW2148363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce45f8fa81db195891f48e34cbb88755687dc847b460442c5af394229911482e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SE6XW2148365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb275ac6b46f25c405afd24d8d38136defd78132a6e32230a74bac807807f48a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/SE6XW2148357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2b64ff93934e6329562c01b5ad9d0e840930e3b5d4f1123160e8f1d11dcc9b. 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/SE6XW2148358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0428ed4cbaca94025f8230b0d5948342222ffe017d3f0625e1f4ea1d06340c9e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SE6XW2148360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e71b7ab103829794384525b6f7a818318f545a22cecddd1ac0dcdffcf2d5691. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/SE6XW2148362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9a560706ca6cd8c887652f12449ef52297912b54b7e8411de10e18df0e56cb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZMER2331582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f17bcaadfd68456fb0817990979423b7cc0da25647708ed631484ef084dc853. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ES8022200281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237118095a904d37c1151a005d728bed0f5b0a98b6a6e334d76f0e954f4f366d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE6XY2262704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4618b4d7d9bf82a3a6a6201449b32942242fa7a2fb2aa346737135576d8a08. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SE6SA2354845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b81dc05221026608d40e1bacc43752fd310499bb4ae033b67af928367732d4. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/SE6TI2351967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4dc4d531aa8759d21ae682315a0a310db209b180d8f0d2b2890ee56be298451. 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/SE6XY2300418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634ac924d28774633a9db22f6b514a0f15b07464f92ad41a651b6fe757b2aec8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SE6XW2309775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda07dc0dac91e133e66f534e30d1ba7253eeb0215c9671600d2c4deb26b1d0f1. 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/SE6TI2322139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe528eec997f3ec055e8539c74591e84c4ce870898c3767607203c3d6ebf48b3f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE6SA2388324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44599a2104a97c3d2d95b2e8c4ad5c7bc0446833a52025477812da35bd4639cb. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SE6TI2344386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf152b6cd2684546d85822b8f9878602ab6c7bbeaffeb7c5cad9d69f14ddbd2d2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DGA092204390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34930c55e6deb2996747919a7480271f96ab323644ac5554d72c2b33f7fdb42. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRX452309804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1e9c3be7a4dfda450a6558e2bfbbf545cb93136873a777dc1c58c22226d6ac. 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/QZTVM2282528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13219b6ee7f89be9fa5e904e5e7394c02a6c49a83c36eec58a4164ad7989c4dc. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-16T14:10:58Z), 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/BK4DA2453948.