Leipzig is the most populous city in the German state of Saxony. The city has a population of 633,592 residents as of 31 December 2025. It is the eighth-largest city in Germany and is part of the Cent
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 0xe9c2e59c5be69024b0ffbbfba880be19ec4ed479e1f2cc8b32fbb1ff9e80647c. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/acfd5c99-ccd6-4407-8dd1-71dfc8dd6929.json and https://artists.proofprofile.net/proofs/artist/acfd5c99-ccd6-4407-8dd1-71dfc8dd6929.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 0x95b5cb5f4adc36775a40c5909a26a2fce4052e515864fbf7d6af02722e978b93. 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/TCAIC2481045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc514dfe8034dbdfcf982d3ee196bbdc630e9288afc876cac6301b44bae7f7d. 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/TCAID2481049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48911319d25744b126c4f843e361cf1c0caeb3e35d4b7ab52ccb70b254fa0d1. 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/TCAIC2481052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee8b1c440f744059ffedd290e6e488b0c4a1e3e370f861102dddee9d4256e3f. 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/TCAIC2481060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117f7f3a068761bbdb309fe7685b646212fb27ab235a0f571ffaa3ae5e21102b. 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/TCAIC2481070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe49b682f2dd2cc50fb2ccae33331248c376518760dc4db516fce8955debf5e. 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/TCAIC2481073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ed22adb5a77765872db1c53fcb2647231cf82c284db76a0bbb253e9cf0a567. 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/TCAIC2481078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc771a993ecc16344be04d131d627924b580ca3786e4669b264f006238ebf9a30. 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/TCAIC2481081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc190b7b214137f349b310c8e8c7d17861b7e303b49cb3b89dd63b91515524331. 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/TCAHN2388074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec4f1ed37ebfda078186bcde8b0edc423cb278613345039c99a5d5946f65130. 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/TCAHN2388085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a954683f0db9c75f161e6b18f87986e5226a5834ab277d3ffde812b31d5ebaf. 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/TCAHN2388097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed301b50191ca5f0924e9131d069198b7912e7e0c3a6bb40fe8473b3febd9049. 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/TCAHN2388120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9734f9e7f0998f9d82a885f16456773d7c2036793478cb8472072c862c57b0. 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/TCAHN2388133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ee16c4aaaee3e4ed54f85fb2e8a3d77ae149a9906e8e5f034f8f0c28ab5a35. 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/TCAHN2388140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178b7ae765eba794605c6401d6939be476151a6aa91a52725c9acf75e3829338. 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/TCAHN2388160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce57e53d151993535f523486aa99c29613f587729eed5b03f1eae627856bbfa. 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/TCAHN2388165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab32ccd7d8815c1115516d742cfbe63b91040dfd83d7e70a830ab34dbd06007. 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/TCAHN2388173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb327d6fbfdd7710917c0e459d942408e8177527f24d5ea59ef5b7aab62e029b. 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/TCAHN2388181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650b2fa21a7e1803b2d3a34b03e3bfde2a7bf14252829158b1e1671d3ee23a37. 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/TCAGM2212011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4a2acbc08988be25dcc15f247a01b1ae4eac445b2fd14af7c34ce17ddf3484. 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/TCAGM2212050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b818c08b154e6d50d781e789b41bbe32e3d3a329c0c7a585412e5dbb2ddb05. 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/TCAGM2212064.
Manchester 56-80: The Pilgrimage of Tuan Curtis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75696d9066fd6b5143e804237abc1d28e86bd5bc6261a990f9e5117db11bb903. 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/TCAGM2212085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1edbc822a0f13fc615ba6564218d0e83a097a925a6b08a32e7f796b2584757ed. 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/TCAGM2212092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ffcaf67779e36719468aa762863a6286d0c3af3be4fcc33d4095138e9eb1f5. 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/TCAGM2212100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cf5280e967b1ce53dcf5e4869ad54529da258af7e3c2fbbda8e745cb0220b3. 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/TCAGM2212103.
Gazelle (Noam Chomsky's Unanswered Question)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4395bccc93aa1010cac357b16f26a38f54b825056321d143c75fde17d7bf4f8. 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/TCAGM2212109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c2eeab4c12d9f9bc100e7aa59a1e67c279afc4f49b61b1e1f5851bbc975fd8. 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/TCAGM2212123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05319636ea5f945e8c8e025fdb78992d4d1ac04b54c8259183261df46464f63. 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/TCAGM2212131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa028372d5baea6b362f2e65f5e534b1553e835747e2f18765b2ed6793e294b34. 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/TCAIA2442789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660deeca594a64d5d57065309a7adb5be73a26f1543090819a750fdc6c7d8b7a. 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/TCAIA2442803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860bb70e9930ac70576b1951dc9b52a110e71fb97033bdfaa42f6073e77b36c3. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/TCAIA2442815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9582fa61e3933c7d8365c7ad081f1dcdbbb29afe86af2575acda335e3f0f7f. 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/TCAIA2442822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32eeddc7a10b13caf8f7f861f10511b2876a114abbd4c785224b32b4d2e53fa4. 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/TCAIA2442826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f91be1a9a955f88657227014b51808d52e6136fc99b551e8fa4ac858c2c7b0. 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/TCAIA2442831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc561f07aa3c7c166d4fc6a582ef7437af9763f38e033159d036caacad1c73c70. 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/TCAHG2323149.