Roque ( ) is an American variant of croquet played on a hard, smooth surface. Popular in the first quarter of the 20th century and billed "the Game of the Century" by its enthusiasts, it was an Olympi
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744357dd7b7f285bc5f0ac1fd5c736c8031b67f3084ee267bf6265c8242a737c. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e557a63-cbc9-42c6-9b4f-e3f79a1b8a78.json and https://artists.proofprofile.net/proofs/artist/9e557a63-cbc9-42c6-9b4f-e3f79a1b8a78.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cfe80615e8b9267c9c4f8c9950bc421bfd2bf7d73cfe15a383bb958aec8b34. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZK6G2215662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb523b08763868217e004dc19af725a1c7eee8802b6bb03c9c2c68c6a0ff259db. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T23:36:30Z), 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/QZK6Q2359775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0649dfda66877555f317e87ba56c0eda202d5efee24ba071f931abbd33470c. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZMER2346994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70323fb5d7fab4a7d987f24e21702b439a67c3ebe9e4295b4e0b987738f1b38e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTAT2368667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfca73f5914ee1843dc95c29f5919377a512b01e495ae2ddd2f2bc5f97dcabb. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZTB62394566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edcbcc18774f5bcba23c020e38ab8449a64cad30e56652a08ef9eb061248af4. 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/QZTBE2352520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0fcd975133363b61c8488d0275bd8fc38cc46646f9882ce8ccf2e9112eff61. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T23:56:34Z), 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/QZWFH2327764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe5fb9fe17a8fb87b639a75fe1d5888dde8237cb507dfa8c630be0832803c9f. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZFZ42415478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8ca58325d1a36dce1359f61dc597e9ba04ba598ec7c32d79cc9005d5825b63. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZHN52412763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97f3ab1cdd9462fcd385038bdd8e8205d8ce859e24ad7dac14f2d2b9758f8c2. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:41:26Z), 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/QZHN72432078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd67648f3ba7a08e97fae053ce231b6a4d6665cca1e95d96c2e59ddfe77bef4. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:53:10Z), 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/QZWFF2408411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424cc9c5b246954a91c1b00aaadd4e7ddf332e4dea2c085601fcbf4c7fcdbde9. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZDA82528350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24c2a68ac9177d8a4ff6c628780c2cb13928db8a462ceeded10d95090e23367. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T10:08:13Z), 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/QZTAW2556678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5e1a27d39387179821023a6861da739020c52edd80e60902d6d0e40798de3f. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZZ7P2586002.