Polish Club (Polish: Wspólny Język, literally "Common Language") is a bridge bidding system which was developed in Poland, where it is the most popular bidding system, and which is also used by player
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 0x3251c2b304dafeb9f873e9be97158e3c00a0837389ab24c2c0b4d2dfc12348cd. 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/0afbb430-1448-4763-8cb2-6bdd47bddc3c.json and https://artists.proofprofile.net/proofs/artist/0afbb430-1448-4763-8cb2-6bdd47bddc3c.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 0x38b690fde4acc75758b12b1d656945bbef597dfa9bbef3080fed4f76824084fc. 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/AU2DY2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1ece8a2bba8896bb4112019b944427f0a77bddc14555730077650d704fe686. 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/AU2DY2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a52d3fbbff4d5fd37e34066471d7aef123d40ae694a8efb9f524155a9359cbc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/AU2DY2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e9340bf0256f870a9f01c9030cd12cc21d95c98d8fbc87cbaebc2cd5d4425c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/AU2DY2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1377f7d0022340ab830e1b3804aff45b570d22bfe506508fe9165f70d02edc12. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/AUUM72100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ffd391ae36ed5b3901dcba7397508acb5160b8864cc1185a5b0090b9616bcb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AUUM72100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451b51a8823f1b63483907d04afaa3786deae66bbd7255aa6caee8934c17da38. 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/AUUM72100112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9810a5d9e67a27154e25377b7106a7733e4db1e67022fa8183b2cefd498255. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/AUUM72100113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18cc9045721bbb254b38fe72f80e97a0944ff0dec6704b2563ddd2250c2ff14. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/AUUM72100114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae07053a5ad2ee12329dc7c0aaa289ec2f5c115d31b93abd10e2a83502cd655d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AUUM72100115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29ff6104d6f6171a9d002461830831db01c9f7820e92aab71d17aedf354e528. 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/AUUM72000875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9acbc9fec7e43cdc6c30d191a96086768d09f3b238e3c4d912bf4579741b4c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/AUUM71900112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9332fcbe34e9fc4aa2219cb1cfa2cef280099fb33158f950386bf388f20aac. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/AUUM71900348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde882bcc5a9f8753efb905ba4575cda500caf6f4d49cbe63808438f4829751de. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AUUM71900349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9506c4b0d3fda862121c8961a47bc74cd093350c235459a76468fb0c96d035a. 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/AUUM71800939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa79baabea7a87d0ef448743af0a23e7f4d325147bb81fc2a9b78d0f201c58cd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AUUM71900350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c5b422c1076cd0a79af1f24ae8a63a94b90e5da6b544903cee3d53a71d6577. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AUUM71900352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb676bd1ad7fae0e0952c71b4724aad7c6402eb852886493e4cdc7c35ad1f7e57. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AUUM71900353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8509c2ea05ee82334adc98362d61e7cf0405b4db1434b023ec3317ac0a8ed506. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/AUUM71900357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7497b0c7d5f37dee6248af9bf02a050ab9ba1f799bd8ce6e0c88609377b862c9. 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/AUUM71700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a21d22381b5dd9c690eb9201f2816f6ffc43765d450bf7f703918d3290b5b5. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/AUMEV2469977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df040182072455bbad86ea1dce5123fce25221b3df2555cf82aa960e59d11c3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/AUMEV2446909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df040182072455bbad86ea1dce5123fce25221b3df2555cf82aa960e59d11c3. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AUMEV2446909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35455e10996397e709590cd5acedddcb507b0b683f983421391374ae121d8d97. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AU2DY2300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e7d0788554d6b804a5d45ae702aa5bee8c98e219fbc69bea30bb7a9903bd778. 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/AU2DY2200459.
Never Be Like You (triple j Like A Version)
Never Be Like You - triple j Like A Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84bc9a1d7147a46c1112450cbeb4a7303de2f478d25a54090a4194865d1beaf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AU2DY2200458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b690fde4acc75758b12b1d656945bbef597dfa9bbef3080fed4f76824084fc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AU2DY2200004.
Just Talking (Northeast Party House Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ad258e7ab0d17a1b4013f81bf5ea69f13d17c3a48866cc04eb1c4c3a255f91. 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/AUUM71900952.
I Hate You But You Gotta Stay (On Christmas Day)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a50fbcd29532fd80f941bde081e984bd40bf9be571a0cbebf98d3df135e7dc8. 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/AUUM71700830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd867798f033d60738660a72dcf0306283afbe91d9ae81fb405400993f00cd6fc. 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/AUUM71700800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50e778f3388608bcc1dd10d3f7ac89170618cef3c2d4ce9bb8656844c19dfd1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/AUUUG1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e61abeac734c6e80779fd812ac9e0c230c08655510db22c30aa6e735ea59314. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/AUUUG1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e62b430d9834bc2adc1e04f67eef08f02a84fe5c0b1023110219ee39d69745e. 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/AUUUG1500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed3b39a167e8e377af75d9a55bad1ee9f61bf37494c98ae8d891f4513cc9ad2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/AUUUG1500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ee17b6c0bc396a9e6f761c8abb8bcbb61865f0edffc3e62fc6e5a592816300. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/AUUUG1500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51435170de0141d5c64089791679d216316056e7e94440dfaf0edc24e5886d52. 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/AUUUG1500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9db29b620f0d935281c74892d0f0951a7d6cc80a8414b1f14c11d15c7c669d. 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/AUUUG1500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164b0842edaed75db6bb68616d1873e7c966a7952ffeca7d94eb31e767aa97a1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/AUUUG1500006.