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 0x976682b59e5a047f2094705012e9c20e549feb0b012a88f705db641c8ccb6d8f. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3fdc8e53-db5b-4ee0-a68f-a5062d44520a.json and https://artists.proofprofile.net/proofs/artist/3fdc8e53-db5b-4ee0-a68f-a5062d44520a.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 0x253e183ea1bdfddedf02b8a4a58317e956c41041ff9fbf457196bd6710917bfe. 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/SE6I31998803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc859a04de33cea0352dd1104dba7bd42487ed88c0359cd9d301d6162edfe3211. 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/AEA0D1806618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c52ae5729ea25f0b80413721f39e4cbbac4533a665c4abde75cd79246d6714. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/AEA0D1806620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d6ea7cf7aa8c5edda1092b5d5e6699294386d4482c77d447d716090ac7bd14. 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/AEA0D1806621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929627f88b815147f726e0823f54374301275ea4496e404712840ecd110dde6e. 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/AEA0D1806624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe546b5fc02b5d2c7936b954a39a38e5fa1271e261278bbe1db9911e94477e0ff. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/AEA0D1806625.
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 0x39de4bc1bc4c9086dfa8f084668cd2a813b657a400b227d94c338a725c22dcd1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UYB141723001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb415e290b685c2ca052ebf7018deb983ef57837fa6cdd37bf1e9644479d046d6. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/UYB141824102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17c9fa6495fe54ff20e4f8533b799b1dd92298a83217f441315393594f6e048. 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/UYB141824103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67de43078c1749193485edad9a187d9d51007aaaddaf2363a19f3201a530c784. 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/UYB141824106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0008d286866d6e679484454d2e12a84fbc089c3c22952bcf7105b8d99118a13. 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/UYB141824110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b739c27c9e96e33d22ae1b6009b41f25972935fd9b2537ee1890548f96ca2d1. 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/UYB141824111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13b3f48bcbb855a14aa59071869b1e8281c19d2a2c9212ef560591770a29fcc. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/UYB141824107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2bac1ec9c133a0e04a15a5595a4f74f895959e3f863a278e263bebca04451e. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/TCACS1636881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043936298e166571992d65d8bffa1d44109a5f65a9d9368d6e356ac05e765cdb. 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/TCACS1636883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74959ede20865c836d09bd50dea7c81a934b45fb0e073de4db6664ed02113bc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCACS1636884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2478b81398be49cbc4c438477ce04713cc6feb28c363a266ff4a7f462c0ffa1. 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/TCACS1636885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3dabde6e6416220b859b47ffe622bdeaf7495f9f623847a41cff3c5f757991. 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/TCACS1636886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7428cd920c5b91b3bdce4f0b21d38dc14ed874c348ae685f2523ecc8485bb596. 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/TCACS1636894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c894d9410e7854ad0465c0aafc8e4b9151185044b4d679122b66d98831226a. 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/TCACS1636890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1634e13cf6fc0acfb455286d50e7cc1f26d64ec9e56314747e67227efbb00ba1. 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/SE66N2213770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246d09f7c2c2a1db21e365e1228363a3bd045bfebf32c47ac8545c4387bc3559. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/AEA0Q1806764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c940f23661761ae7b409c2b326ee34d3cead7f4f47141a9bd0b736574652152. 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/AEA0Q1806760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa9756f4b3f1dd1696760be99f488f01d24a5d409bd5f3c4359bc6a5ade82d6. 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/TCADN1861803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4adf1b5a6c271f12d6f3b45bf8aa8a2de42539a1dbe9cea5591918288b7331b. 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/TCADN1861823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36dd70c558e8d20f4ebceed60be272d70322be4087a889bb0396dfeee759195. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/TCADN1861827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe976a7de0dca31af4bc35929a91e953f110523fcf64d0f19a0767c7ea0b454c1. 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/TCADN1861829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30239acf7cf63ad1d852bab141f8a58211d866ca893597a899ff2a10e79e0c75. 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/TCADN1861833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf33fa1e1ac428904e57d97a7a096b644ecedacf9c47c5bed7183871156d7c5d. 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/QZHZ51917494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd55d881b3ec80cbe3479162fe66508ee7748108098165b3fa5a74eb05a30f6. 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/ES71G2321821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fff90f8c828f90e1701a5b91888e142f5244cfcd1f4bd5e78fa0a52792df474. 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/ES71G2338075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d845afb18096d435ca39c4cbf8c9b34ae008adc5a8d8eeba0a804e1b1c33a9. 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/ES71G2338082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b98d23a96e1ddd4f94453e4b9caef37a30a0599f9fef993bb3b99a8e56403a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES71G2338078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07151399cbc0255f78ad14c086d2dd90db21e53b79999031006bc8d9b251fc82. 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/SE5BU2424819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a46b26da1b103da203aebc5a659b30a11ce019d53fa61aa29041ccd77528b0. 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/SEYOK1855566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df8867205e639b0fd43c26e45241d441acc5929c2b11932029bb03a0dedadf8. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QZGLM1980635.