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 0x5c6db440b8edfec41e555d54a1c6d383d5017d038f623f0ed4882913cf0a15aa. 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/44eb20ab-0fe5-40c0-b2d3-2253960e9e39.json and https://artists.proofprofile.net/proofs/artist/44eb20ab-0fe5-40c0-b2d3-2253960e9e39.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 0x8924d172938c96c2cd9cea24b4498f076295b8115ec20df2ef33c7cbddcce1ab. 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/RUUM72000378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673c1033d572563dbd00b0bbb9dd8e89fce1b7ce37a5f5eaa092f847722c61b4. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZHZ62221039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19e60c0ed29e7fe849e441da60959b9a123ddf65ec753d9ca7748dc9c520c37. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZTPX2283817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2cea066728334b34e67da944f29f6bd9b488ed08427563bd3d3aedddf3e6f6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNJW2339241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520d3331b87308a4fe1fec05a969c907d24038e10d04208ac7593b974ad0b24c. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZL5N2440657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef409d168bf41cd8823c53ed0e59cb01381a7384a12dd63ba8475dacb5f61c60. 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/RUAGV2404614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc1312f57b4065bfa28a1d648f1a189baa99d590223523ca08634fe7f2b0ee4. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZL5N2444596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa13e7f83c79a9026425a14053d389e3003044028ebe0801bca3626dc86f06d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/RUAGT2433601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb9c878da6ee672a67c346a4fdf15661cd7630d9e7aba817805e6eaceeb2f39. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/RUAGT2433603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4bbafe785239171de413867c5f71d23fc8fcc48640721841ff942c877aecaf. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/RUAGT2433605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73f5f2563a853e77905d68d775da230f854482fc07ca12ad8d270e47880bfb2. 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/RUAGT2433607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e808288b6d1aa9334517f257701e239f1bcaf51485fd422ce01cd31f435114. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/RUAGT2433611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e60d15d96d65004c3a8a7685508409750ded0a8bb2c913352396c05343a6b04. Chain 2 (Bitcoin): anchored in block 957826 (2026-07-13T08:56:09Z), 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/RUAGT2433615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd8b160e56ceb5c859c404cb8397c02b95a0ad35c907c7889aa51ceb2e78907. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/RUAGT2420421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba75c4a2cab28ace600d4eb0f91c93d274c3ed3b98f5eaf12fd7431c14fec318. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRX452538755.