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 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 0x949367292face54ae14d89d35f910a8e535d5593218980cf21e2f2f8ad2e0e3b. 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/e9fbcdb2-ce36-4b1f-901d-2b708a7dc3dc.json and https://artists.proofprofile.net/proofs/artist/e9fbcdb2-ce36-4b1f-901d-2b708a7dc3dc.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 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 0xfa32f81d2c37e0ed1da5f5c7f48af89b0054ec48ba5595fe18cd095728badc8e. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/HKG732424022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b41fdfe9ef58f4df0a7ddc757c46efdc4dc98a2765fc0272debcdb4e418c4d. 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/HKG732424021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc8cf6d878e02277e01373f441535c0acd033d57de2a52442020d2cf3fc3322. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/HKG732421980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219307281373281c17b15dc9b48eec58e46b88b5344ecee3be5cf6a8e8dbb0ab. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/HKG732412841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679c81969216684f9e7bb46d4ee2566190ffacab4a87aaf6cd322f8b3be9c3ae. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZZ972479104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0755d647988923b77fa165a178c0488155c878f627f341f0d6e63b11d23f36. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/HKG731672672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8921c2c16b61e5d6b6972a77b0bfed4abf2414d0e5019067f082a467313a780d. 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/HKG731657847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaed2434e7403983f0a8a4716545f3e1641677ad64f0e591dcbd00a483e19c2. 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/HKG731647836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa21a3623c4f16a3fdcb47bac9012258fbd5f89ba2bf11b3b36af35c6d871909. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HKG731647835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336617fd90f9a208f5985bc22375a4b0df2a46a704cbebdd798e895e7d3f1d6a. 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/HKG731603005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345675ed785ab7dc4a4463576f4b4ef597fdb7e5f17fe0fcdb1de5bd80ef147c. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/HKG731601145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f0c0cfb8db1c8ae1a2fb93221988e13c732f87fa6b507c46f396e355b4c853. 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/HKG732387789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e6d4d4be8586ce9353579ecf616bf9b89a998da3b1566e06f1d3843cc18a52. 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/HKG732383655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613c171f69ad5f7c92a23a8957eb853ed69c39dd9de081c852d3e44e4c2f4efd. 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/HKG732380707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad49841f13426620d46330a79dcf0f7a526508bac9b411d154d44f90065d0367. 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/HKG732372757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5635d33448013f46d9a95edf9a12440b64b2ea2457cb05b1655961f5d6a0f956. 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/HKG732361981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd1b34696305147205d4471a6ceded12a38c8cde508bf98825309234899da23. 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/HKG732357488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c49f634ba14b76c1deea69f044bb14dd2ce1b9e97df364ac2b7672b14d249e. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HKG732355528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f86f97b7011b40c891adcca0c7e9c27304f0f6f0cc3c1c6978594c16003d6f9. 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/HKG732355520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d61455311fb4da2087c04890f28c31cce035d21e162ef83047ce3b609cbf4d1. 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/HKG732319514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f734f3861c806e6440ae6ac2c25de8a68c4c1162fd5f23304877592f2d386d3. 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/HKG732319515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa64d92439af69d746531e3ed0aaf49995c5c589bbc56659a0b65086aeda991. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HKG732317711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a00b5246217581ac03b154622ccb021f29b110fab73f10156c5bd30897c898d. 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/HKG732314008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0d9e7bad4b29ce8a23fc1db3df05bb16fd1eb87a8871fcbb5738d29a1e1fd2. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/HKG732310349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa413bcfd1bad6538615dc7755d7972b06f99ac2bcf5e82354bd7067848b77f. 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/DGA092220833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4aa8cee1553e5cf510c6332afab66dce0f49bc58efe73a09926669ff1bd4b9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/HKG732301601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458cce9a65148d0fbbc5a7ef0af2ad5f730b6daa22ab7950ddf0511d2c1304e5. 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/HKG732301447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb3e03eb99fa5ebe39bb567c430001c54f7ce3d686fa4f6e2a4f882173adbdc. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/HKG732293436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228df29fe662c2f5f6b7d79cf31cd0d7c22c7b72a01d20d5e7bdc8017748f219. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/HKG732293437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81623474edabbe2cf70165d1d7ff20e4b2d9eec6b2e577cc55545b1c614c4bf8. 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/HKG732293438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e45a4ad86e43c3ba6bac8e8647752eef78a82cec74dcffcc3633b876d5b985a. 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/HKG732387785.