thumb|Martin Winch in 1997. Martin Ronald Winch (28 February 1949 – 21 May 2011) was a New Zealand guitarist, composer and musician. Life and career thumb |The CD Espresso Guitar is Winch's best-kno
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 0xcd0c638eb6d678f64edc86ab38d3f217930676609a9389aff066e40890c60f12. 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/dadd97d5-1481-46e9-a446-2c4c20e6f5cb.json and https://artists.proofprofile.net/proofs/artist/dadd97d5-1481-46e9-a446-2c4c20e6f5cb.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 0x1dd1e7488204df07e447e10fd22e6db230766be78ba7b453ea2cd72fbb87af96. 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/NZSG00800210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99451be00106497cb8f93bb5ac77059739e45c4272c07b4583de32a11752d76. 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/NZSG00800172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00dc36b9929b80e5b5e8fe40fd4b29695b757725ba36202f5cb34932e430af5b. 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/NZSG00800039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8310430e4e21e93416f93dfe1ec73587a37911f60077c95d22413c5b284e96d3. 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/NZSG00800144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46f0f1d35532d5b0a5f112041581e556018f1ef3bdd6b0085d224155b0b548b. 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/NZAM02224814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11e2bee72c19a6feba50a34ce8d6b28be012e1b1590b86fb2911a60d57c9489. 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/NZSG00800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a28a98f02e7669baead1b1fa63b8cea280d41c80ea7dd5398c09360b136881. 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/NZAM02224815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a3832abdb8dcd163026272cf3a7d34eb873f60c17387ac753f1e4464fb3e06. 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/NZSG00800158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3a7731c610767c52a26598d09ddb8d0aa683d6c92eb678edc038772fcd99af. 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/NZAM02224816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de1041e68f136f5bdc29857f3d83ae11ac23b75174c066313f3073e89bbd4bd. 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/NZAM02224817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aac4a2e3ef17177ebc2b846a4c0a338cbe087f1d26c0a5474a8ff84ddad7af5. 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/NZAM02224818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452c2ecc59703a1396767c61f01f083f7a5f3373a8cfdfd5c3c2bc2c6ee7c6b4. 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/NZSG00800157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c9009b030c71cf54c256b9042d9389b17ddeccf29f255375c79e8312b6cdd5. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/NZSG00800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f7b4b30acd1620d44ce515f438bf768b4cf5a200636ed368badef56d2a137d. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/NZSG00800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8310430e4e21e93416f93dfe1ec73587a37911f60077c95d22413c5b284e96d3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NZSG00800144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06b8c264fb08120cf27eaa5cf0d45ee6e8ed1ca9935a8b52c5a6cc697acb2e6. 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/USD841010236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd8f2fc7753dee786ca9c4198dc5c78a40bf2b72324dd51bab6fc5094e850c4. 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/USD841010211.