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 0x882f7390ef570e95f919dc514d0cd92b1d1c7f4558d7dc168933acc68de6f167. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7e2e904-d403-4062-b980-79b8a6b5e8bb.json and https://artists.proofprofile.net/proofs/artist/c7e2e904-d403-4062-b980-79b8a6b5e8bb.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 0x481aa4021799caed83e836bff7233bf550731db944af91603a25d966822233d0. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZK6K2217341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80cc26d450a3b666d5116443613753af20eb5ee38d472531451cd7b5c99021c. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZFZ22399908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x359351802d03fad022789c48308af4999f37689bb6d3c90b207c49cba9101f28. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZRP42333009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f3b40a3ff976cd7695aeb411f951121f0fac7d852c3a2757bd503b65e86d05. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZDA52459009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b16ab7b322d26974c056826a9997c2dd86c210cf8e871e0328d2833bbc0cb2. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZDA52459010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b0b95a7a995545498dd79ea4ecf60775359e27be95a7c7d08dddb065f3a908. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZDA52459011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa341c0533ecdea372627676a68bfb14553a31923f3835b3abd7283e7af1249d0. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZDA52459013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4069d8ae9a38914a703801be68c0f403f7be0020feeb463cfc7d76d76a60eb. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZDA52459014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9f539687687ed68642733b1a4df4240674ea9d91ce79b4a08846e8904b7098. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA52459016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd385e16c51b892b200b3061153c3d2a0abdf1bd863ea82976681aa9d09940696. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZDA52459018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997fe9b155f80f07cb9b6cb622ae78cb2a4cefd1d6f5ea2987c34fc53ca61a58. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZPLR2428017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57ae6ea5399c9905ea7c905176e3cc483cf33b9e7939b20923f3cd45b54d647. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZPLR2428019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8108ce9b113d2c5f67120825ba7bad7dd74669fb27516c478995289d8ad77764. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZDA62538374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1e12e63f824b08c07aba1dfe77f298ddb951e5a452826f1b4905a652bba605. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZDA62538376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174d922b927e68b83d332a808fef5b0ddbf799c661aebb368f5118fad9faa57d. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZDA62538378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c817e1cd11f0c4071effea3e25ac509c47b77fcc7db4bb4cb0867f7b0dc140. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZDA62538380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac1cecc468fec2f00508add5e2849dfd7d0bd899b5266754a948f8255254204. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZDA62538381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026c64b8e550e9ee6951e933500d60b4dcae0a369ba49525a55d09ec80fbb52d. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZDA62538382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3443272cb07099e34175db7d3a2bf36924d642364de119bca0b7a7b3963af1. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZDA62538383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93def816cc3331f158cceea3d7b74c4ef7f4c4650deba8dc981244b6c7024e01. 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/QZZ7Q2549679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5425ebd81a9771e6009a37cf67ac4fb1cf502c5b9c1565dc8778e826f3998d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ7Q2549682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e49ff54b10c674a26dd937cf01f2ae517d610f24f8b9b6d8b7b6466db4eaef. 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/QZZ7Q2549683.