Vienna ( ; ; ) is the capital, most populous city, and one of the nine states of Austria. It is Austria's primate city, with just over two million inhabitants. Its larger metropolitan area has a pop
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 0x0d36ae2cfd0175883e802f058849e453d47d55175345cccbc55c63e88872e523. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a37e6426-0ba2-41fc-8edc-03c6ec677f6a.json and https://artists.proofprofile.net/proofs/artist/a37e6426-0ba2-41fc-8edc-03c6ec677f6a.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 0xf1c80aeed641ac7f03fd367c9c113822d63362bef8731b44ffe8a5935058a85b. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/ITGQZ2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3159c8fc679bd631f9a8248c3d0442434d92237e827f121fe5718891aedd0c. 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/ITJ782200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf301672f1a4cd432f6a156cde582a10417d6d30a27283a3cbc25afd080c2c184. 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/QM42K2103525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7fe7f36dd436ea99a7dcc790260d611cf43c5dc6bddbac347555346ebeda2c3. 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/ITJ782200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ae8962f7f6a4d3d22e08076016a1fa88603e8bbde7579afa2e32e7e179dd98. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ITJ782200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2702860377953ddd30557760f1eb24f2c0820987aa4f9ee29aa8162c5f46cb40. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/US3DF2275496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0f3490f5cbb03fd420b6a150dc4ed038124b6d4000854a3427347955f320d7. 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/US3DF2275497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f6b213b313a23e0d94f2d97aab209d028d20a0d4109a81625dc637f467dadd. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US3DF2275486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8527ac0c8e6558cc79915bdc77d73b188ef01c8edbc3ed18f673313e4553f58. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/US3DF2275487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2e3e366d2d86beaeea4b1529c1b0f852a1ac3b095ca5ef921d704131317ed7. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/US3DF2275488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c260cc2a985f0fa9f2cdb7bc1bd53d9bb00d5880e0233d201ac3f3424c7250d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US3DF2275489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24147683c413f2f878f130538bdadae3afbb00c96d69606c36685e44e5205d11. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/US3DF2275490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f7f869d331c4b32b10464daf3fb1e05691636a8ce8ea2892f9db90df11328a. 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/US3DF2275493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0645970f889846b4fd2eca209821f863b080556e4dbb37bf718c3f0f5a3e1996. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/US3DF2275494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb538953782c0fb02a47820a1d27b540d48bb724d3b8e9aeaebd4c50c891562. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US3DF2275495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd6f76e18dfbc01cb0eec13ee911f0bc49052981d78b7c06cfbdb1a908ae56b. 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/QZFYY2150427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d38e472a0635f039d066adb11bd4f00ec9c8d55a351c97c7e82ce41fee0169. 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/QZFYY2150430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01de8740ecb3295c5bd4f24b0bae5630dae7e8599322d24b9454e1b3ac051cb5. 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/QZES72067448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2b93db567c17d479ed49aa2bedf0bc1cc25e8aedea94bf576f57c58f7821de. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USANG2111166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37b63c44d121b39c7fa73f5f6426577ce281387f9166a98110db76cbe600649. 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/QM24S2010868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0edced85c231eddd12d25c7be48b3ec2988c408ada09bbe2259ae22b29b87a16. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QM24S2010869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a3eaa355c60fcc0bec6fc63483e299b56a92070579604085f2d0213bc602a6. 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/QM3DF2190520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd636bb5f5ffe9716212725f536f87cebe97d10e95c5adc138a4747b0386a0481. 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/QM3DF2188092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3f4a9c4abca9f1f56596d3bca3167de97e7971c9e3e1080276f321a4c301eb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM3DF2190521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0874341f47649d9bffcaf440645facd55269210ae219dbcd5741ec6cf705b5. 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/QM3DF2190522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1d3b6383a023e8dddac8ce5ba2bf3cc4b4775de8cbb9d6115fd1e6444be707. 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/US3DF2167185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc811a8b29d12b6d5883c0ea57a272a0f4ced6c237562a0f1eeb5470e18e8e167. 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/QM3DF2190523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b81c02adc07267582ba4552fed851e473df7f43f2f382f744364eca9302a54b. 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/QM3DF2190524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9f99b83705b461dd598acdd72e252b21d998b8e115f927cdea9d630f895767. 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/QM3DF2190525.