thumb|Johnny Colon in El Barrio in Spanish Harlem, NYC Johnny Colon is an American salsa musician, leader of the Johnny Colon Orchestra and founder of the East Harlem Music School, also known as a maj
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 0x3232db88809b0b223dcac26aa0dfebb9e626c4f57d8d917a9a1bca862b1b0a2d. 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/8d4f28d2-c684-4475-8ec9-a0db2b7eb784.json and https://artists.proofprofile.net/proofs/artist/8d4f28d2-c684-4475-8ec9-a0db2b7eb784.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 0xeeb1b6b06bca66835e032166d8305167b95f87c65026ed5174ee8942ea00a976. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USDBB0609344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856661bd1806380ec36b25b7dfc87710c18781728f668718fd682c0565f49309. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/USDBB0601384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0429577801964a3677638849fe651a5c0c460d287caf7a8f74b19fc604baf444. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/USDBB0609800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018a3c2cac9b95db3a3073e4fa6664dc2bccc68ad7240692536830d59ca0ec55. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USDBB0609896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19466e0e6ef423eed37d5a74cc8890b2fa59ec35a97e220c898fa0e8734f68ca. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USDBB0601678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401b963ed4061022555b22c459d46e9fd6a646a65cea93eab995b7ccd97cb7ac. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USDBB0601902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbec9b5e4637d4e2b7eed1c488927c575e76bcdb989b62c19affd6634d99c7e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USDBB0605935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9322ce1d37604450896f7b40cd46f92b722e4526c2c0296df8780b61ca1bd82d. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USDBB0604983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fe8b42fa75f1ef631635b6122398113f9533a56e7230659525cef1a451e047. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USDBB0609767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a6c8a95f76ee1c84a098df617c687d9b6768406f546af2936b9e6062173de2. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USDBB0600969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19466e0e6ef423eed37d5a74cc8890b2fa59ec35a97e220c898fa0e8734f68ca. 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/USDBB0601678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf909b6a3ce161d1ee979b65c27fd70d162ba878ec1a6ac395849086183773d96. 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/USDBB0610516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7adb27a3fc425787adb26916de0c49c70ccf4b48679b1ff223b6cf97f28afbe. 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/USHM22498570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628836b5817e096c405e4fe0e012ac89777fdc059fd5d6ee04ccb0f0f84a28bd. 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/USDBB0608891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7b2b62b0604d7dc1e88be139b49387b57a4c316c84b06798d8169c935de448. 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/USDBB0600624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579b51f8625633c2fb20dd085847c93fe9dae4aee5b79ba2f568a62e2ae63a7e. 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/USDBB0608792.